Date::Manip::Date(3) User Contributed Perl Documentation Date::Manip::Date(3) NAME Date::Manip::Date - Methods for working with dates SYNOPSIS use Date::Manip::Date; $date = new Date::Manip::Date; DESCRIPTION This module works specifically with date objects. Although the word date is used extensively here, it is actually somewhat misleading. Date::Manip works with the full calendar date (year, month, day, and week when appropriate), time of day (hour, minute, second), and time zone. It doesn't work with fractional seconds. METHODS base config err is_date is_delta is_recur new new_config new_date new_delta new_recur tz Please refer to the Date::Manip::Obj documentation for these methods. calc $date2 = $date->calc($delta [,$subtract]); $delta = $date->calc($date2 [,$subtract] [,$mode]); Please refer to the Date::Manip::Calc documentation for details. cmp $val = $date1->cmp($date2); This compares two different dates (both of which must be valid date objects). It returns -1, 0, or 1 similar to the cmp or <=> operators in perl. The comparison will automatically handle time zone differences between the two dates (i.e. they will be sorted in order as they appear in the GMT zone). A warning is printed if either of the date objects does not include a valid date. complete $flag = $date->complete([$field]); This tests the date stored in the object to see if it is complete or truncated (see below for a discussion of this). If no $field is passed in, it returns 1 if the date is complete, or 0 if it was truncated and default values have been supplied. If $field is passed in, it may be one of: m, d, h, mn, s . It will return 1 if the value for that field was specified, or 0 if a default was used. convert $err = $date->convert([$zone]); This converts the date stored in the object to a different time zone. $zone can be the name of a time zone. If it is not passed in, the date is converted to the local time zone. holiday $name = $date->holiday(); @name = $date->holiday(); $name = $date->event(); This returns the name of the holiday if $date is a holiday. If $date is not a holiday, undef is returned. If $date is an unnamed holiday, an empty string is returned. In scalar context, holiday returns the name of one holiday that occurs on that date (the one first defined in the config file). In list context, it returns all holidays on that date. input $str = $date->input(); This returns the string that was parsed to form the date. is_business_day $flag = $date->is_business_day($checktime); This returns 1 if $date is a business day. $checktime may be passed in. If it is non-zero, the time is checked to see if the date is a business day and falls within work hours. list_holidays @date = $date->list_holidays([$y]); This returns a list of Date::Manip::Date objects containing all dates during a year which are holidays. The times will all be 00:00:00. If $y is not passed in, it will list the holidays in the same year as the date stored in $date (if any) or in the current year otherwise. list_events @list = $date->list_events( [$format] ); @list = $date->list_events(0 [,$format]); @list = $date->list_events($date1 [,$format]); This returns a list of events. Events are defined in the Events section of the config file (discussed in the Date::Manip::Holidays manual). In the first form, a list of all events active at the precise time stored in $date will be returned. If the first argument evaluates to 0, a list of all events active at any time during that day (Y,M,D) are returned. If the first argument is another date object, all events that are active at any time between the two dates (inclusive) are returned. By default, the list returned is of the form: ( [START, END, NAME], [START, END, NAME], ... ) where START is a date object when an event starts, END is a date object when it ends, and NAME is the name of the event. Note that START and END are the actual start and end date of the event and may be outside the range of dates being examined (though the event will obviously overlap the range or it wouldn't be included in the list). If $format is included, it can specify an alternate format for the output. Currently, the only supported format is named "dates" and it returns a list in the form: ( [DATE1, NAME1a, NAME1b, ...], [DATE2, NAME2a, NAME2b, ...], ... ) This includes a list of all dates during the range when there is a change in what events are active. DATE1 will always be the start of the range being considered, and (NAME1a, NAME1b, ...) are the list of all events that will be active at that time. At DATE2, the list of active events changes with (NAME2a, NAME2b, ...) being active. It is quite possible that a date be included which has no active events, and in that case, the list of names will be empty. nearest_business_day $date->nearest_business_day([$tomorrowfirst]); This looks for the work day nearest to $date. If $date is a work day, it is left unmodified. Otherwise, it will look forward or backwards in time 1 day at a time until a work day is found. If $tomorrowfirst is non-zero (or if it is omitted and the config variable TomorrowFirst is non-zero), we look to the future first. Otherwise, we look in the past first. In other words, in a normal week, if $date is Wednesday, $date is returned. If $date is Saturday, Friday is returned. If $date is Sunday, Monday is returned. If Wednesday is a holiday, Thursday is returned if $tomorrowfirst is non-nil or Tuesday otherwise. next_business_day prev_business_day $date->next_business_day($off [,$checktime]); $date->prev_business_day($off [,$checktime]); The next_business_day method sets the given date to $off (which can be a positive integer or zero) business days in the future. The prev_business_day method sets the date to $off business days in the past. First, $date is tested. If $checktime is nonzero, the date must fall on a business date, and during business hours. If $checktime is zero, the time check is not done, and the date must simply fall on a business date. If the check fails, the date is moved to the start of the next business day (if $checktime is nonzero) or the next business day at the current time (if $checktime is zero). Otherwise, it is left unmodified. Next, if $off is greater than 0, the day $off work days from now is determined. One thing to note for the prev_business_day method is that if $date check fails, the date is set to the next business date, exactly like next_business_day. In other words, if $date is not a business day, the call: $date->prev_business_day(0 [,$checktime]); moves $date forward in time instead of backward which is nonintuitive, but you just have to think of day 0 as being the next business day if $date is not a business day. As a result, the following two calls ALWAYS give the same result: $date->next_business_day(0 [,$checktime]); $date->prev_business_day(0 [,$checktime]); no matter what date is stored in $date. parse $err = $date->parse($string [,@opts]); This parses a string which should include a valid date and stores it in the object. If the string does not include a valid date, an error is returned. Use the err method to see the full error message. A full date may include a calendar date (year, month, day), a time of day (hour, minute, second), and time zone information. All of this can be entered in many different formats. For information on valid date formats, refer to the section VALID DATE FORMATS. For information on valid time zone information, refer to the section VALID TIME ZONE FORMATS. If no time zone information is included in the date, it is treated as being in the local time zone. If time zone information is included, the date will be kept in that time zone, and all operations will be done in that time zone. The convert method can be used to change the time zone to the local time zone, or to another time zone. Some things to note: All strings are case insensitive. "December" and "DEceMBer" are equivalent. When a part of the date is not given, defaults are used. This is described below in the section "Complete vs. truncated dates and times". The year may be entered as 2 or 4 digits. If entered as 2 digits, it will be converted to a 4 digit year. There are several ways to do this based on the value of the YYtoYYYY config variable. Refer to the Date::Manip::Config documentation for more details. Dates are always checked to make sure they are valid. If any other arguments are passed in, they act as options which may improve the speed of parsing. These include: noiso8601 Do not try to parse the date as an ISO 8601 date or time. nodow Do not try to parse a day-of-week (Monday) in the string. nocommon Do not try to parse the date using the formats in the "Common date formats" section. noother Do not try to parse the date using the "Less common date formats" or a time using the "Other time formats". nospecial Do not try to parse the date using the "Special date strings" formats or a time using the "Special time strings" formats, or as a combined date/time using the "Additional combined date and time" formats. nodelta Do not treat deltas as a date relative to now. noholidays Do not parse holiday names as dates. parse_date $err = $date->parse_date($string [,@opts]); This parses a string which contains a valid date and sets the date part of the object. If the object contained a valid date, the time is kept unchanged. If the object did NOT contain a valid date, a time of 00:00:00 is used. @opts can be any of the strings described in the parse method above. parse_time $err = $date->parse_time($string [,@opts]); This parses a string and sets the time portion of $date to contain it. If the object contained a valid date, the Y/M/D portion is left unchanged. Otherwise, the current date is used. @opts can be 'noiso8601' or 'noother'. parse_format $err = $date->parse_format($format,$string); ($err,%match) = $date->parse_format($format,$string); This will parse a date contained in $string based on explicit format information contained in $format. If the format is invalid, $err will contain an error message. If the format is valid, but string doesn't match, an error code of 1 is returned. If called in array context, a hash will be returned containing %+. This is primarily useful if the $format string contains some named capture groups that you define. This is discussed below. $format is a string containing a regular expression with some special directives (based on the printf directives). These directives are turned into regular expression components, and then the entire string is turned into a regular expression which, if $string matches it, will return the date. The directives available are identical to the printf directives. So, if your $format string contains the directive '%Y', it will match a 4-digit year. All of the printf directives are available here with a few caveats: %l This directive is NOT available. %b,%h,%B These will all match a month name or abbreviation. %v,%a,%A These will all match a day name or abbreviation. %z,%Z,%N These will match any time zone string. %n Multi-line matching is not currently supported, so this directive is not allowed. %x All format directives are converted to a regular expression and then cached (so that a format can be reused without the penalty of doing the conversion to a regular expression with each use). As a result, if you need to set the DateFormat config variable (which determines the meaning of the %x directive), it must be done before a format string containing %x is used. If the DateFormat config variable is set afterwards, the format string will reflect the old, NOT THE NEW, value of DateFormat. The format string may not over-specify the date. In other words, you may not include both a %y and %Y directive or both a %j and %m directive. A valid format string will specify any of the following sets of data: Required Optional M D H Mn S Y Zone Day-of-week M D H Mn Y Zone Day-of-week M D Y Zone Day-of-week H Mn S Zone H Mn Zone For example, if you had a date stored as: YYYY.MM-DD you could match it using the following: $date->parse_format('%Y\\.%m\\-%d',$string); If you wanted to extract the date from an apache log line: 10.11.12.13 - - [17/Aug/2009:12:33:30 -0400] "GET /favicon.ico ... you could use: $date->parse_format('.*?\\[%d/%b/%Y:%T %z\\].*',$line); When matching months, days, and hours, there are two directives that could be used (for numerical versions). For the month, you may use %m or %f. If your date is known to have a two-digit month, you should use %m. If it contains a one- or two-digit month, you must use %f (and it is safe to use %f for two-digit months). Similarly, for days, you can use %d or %e and for hours you can use %H or %k. In both cases, the first can only be used if you are guaranteed a 2-digit value. In your format string, you may use capture groups (or back references to them) in the regular expression using all of the rules of normal regular expressions. Since Date::Manip uses named capture groups internally, it is suggested that you also use named groups. Mixing numbered and named groups will work... but it'll be entirely up to you to keep track of what numbers refer to which capture groups. Every printf directive adds one or more named capture groups to the regular expression. If you use named groups in the format string, they must not conflict with the ones used internally, or else the date will probably not be parsed correctly. The following named capture groups are used internally: y m d h mn s mon_name mon_abb dow_name dow_abb dow_char dow_num doy nth ampm epochs epocho tzstring off abb zone g w l u To be safe, it is suggested that any additional named capture groups introduced by the programmer start with a capital letter. This is guaranteed to never conflict with any existing, or future named capture groups. In order to get access to the values stored in the additional named capture groups, the parse_format function must be called in list context, and the %+ array will be returned as the second value. As an example: $string = "before 2014-01-25 after"; ($err,%m) = $date->parse_format('(?
.*?)%Y-%m-%d(?.*)',$string);

           would return a hash (%m) with the following key/value pairs:

              'PRE'  => 'before '
              'POST' => ' after'

       prev
       next
           The prev method changes the date to the previous (or current)
           occurrence of either a day of the week, a certain time of day, or
           both. The next method changes the date to the next (or current)
           occurrence. The examples below illustrate the prev method, but the
           next one is identical in operation.

           There are two different ways to use this method. The first is to
           pass in a day of week and possibly a time:

              $err = $date->prev($dow, $curr [,$time]);

           If $curr = 0, this means to look for the previous occurrence of the
           day of week, and set the time to the value passed in (or current
           time if no time was passed in). The day is ALWAYS less than the
           current day. If the current day is the same day of week as $dow,
           then the date returned will be one week earlier.

           If $curr = 1, it means to look for the current or previous
           occurrence of the day of week, and set the time to the value passed
           in (or 00:00:00 if none was passed in). If the current day of week
           is the same as $dow, the date will remain unchanged. Since the time
           is then set, the new date may actually occur after the original
           date depending on the value of $time.

           If $curr = 2, it means to look for the last time (not counting now)
           that the day of week at the given time occurred. The date may be
           the same as the original date.

           $time may be a list reference of [H,MN,S], [H,MN], or [H].

           The following examples should illustrate the use of this function.

               Original Date = Fri Nov 22 18:15:00

               dow      curr   time       new date

               4 (Thu)  0/1/2  undef      Thu Nov 21 00:00:00
               4        0/1/2  [12,30,0]  Thu Nov 21 12:30:00

               5 (Fri)  0/2    undef      Fri Nov 15 18:15:00
               5        1      undef      Fri Nov 22 18:15:00

               5        0      [12,30,0]  Fri Nov 15 12:30:00
               5        1/2    [12,30,0]  Fri Nov 22 12:30:00

               5        0/2    [19,30,0]  Fri Nov 15 19:30:00
               5        1      [19,30,0]  Fri Nov 22 19:30:00

           The second way to use this method is by passing in undef for the
           day of week.

              $err = $date->prev(undef,$curr,$time);

           In this case, a time is required and it must be a list reference of
           3 elements: [H, MN, S]. Any or all of the elements may be undef.

           The new date is the previous occurrence of the time.

           If you define hours, then minutes and seconds may be defined, or
           default to 0 and you are looking for a previous time that the
           specified time (HH:00:00) occurred (which might be as much as 24
           hours in the past).

           If hours are undefined and minutes are defined, then seconds may be
           defined, or default to 0, and you are looking for the last time the
           minutes/seconds (MN:SS) appeared on the digital clock, which will
           be sometime in the past hour.

           Finally, if hours and minutes are undefined, seconds must be
           defined (or default to zero) and the last time that that second
           occurred will be returned (which will be sometime in the past
           minute).

           If $curr is non-zero, the current time is returned if it matches
           the criteria passed in, so the returned value will be now or in the
           past.  If $curr is zero, the time returned will definitely be in
           the past.

               DATE = Fri Nov 22 18:15:00

               curr  hr     min    sec      returns
               0/1   18     undef  undef    Nov 22 18:00:00
               0/1   18     30     0        Nov 21 18:30:00
               0     18     15     undef    Nov 21 18:15:00
               1     18     15     undef    Nov 22 18:15:00
               0     undef  15     undef    Nov 22 17:15:00
               1     undef  15     undef    Nov 22 18:15:00

       printf
              $out = $date->printf($in);
              @out = $date->printf(@in);

           This takes a string or list of strings which may contain any number
           of special formatting directives. These directives are replaced
           with information contained in the date. Everything else in the
           string is returned unmodified.

           A directive always begins with '%'. They are described in the
           section below in the section PRINTF DIRECTIVES.

       secs_since_1970_GMT
              $secs = $date->secs_since_1970_GMT();

           This returns the number of seconds that have elapsed since Jan 1,
           1970 00:00:00 GMT (negative if the date is earlier).

           The reverse is also allowed:

              $err = $date->secs_since_1970_GMT($secs);

           which sets the date to $secs seconds from Jan 1, 1970 00:00:00 GMT
           in the local time zone.

       set
              $err = $date->set($field,@vals [,$isdst]);

           This explicitly sets one or more fields in a date.

           $field can be any of the following:

              $field   @vals

              zone     [ZONE]         ZONE can be any zone or alias

              zdate    [ZONE,]DATE    sets the zone and entire date

              date     DATE           sets the entire date

              time     TIME           sets the entire time

              y        YEAR           sets one field
              m        MONTH
              d        DAY
              h        HOUR
              mn       MINUTE
              s        SECOND

           Here, DATE is a list reference containing [Y,M,D,H,MN,S] and TIME
           is a list reference containing [H,MN,S].

           ZONE is optional (it defaults to the local zone as defined either
           by the system clock, or the SetDate or ForceDate config variables).
           If it is passed in, it can be any zone name, abbreviation, or
           offset. An offset can be expressed either as a valid offset string,
           or as a list reference.  Refer to the join/split functions of
           Date::Manip::Base for information on valid offset strings.

           An optional last argument is $isdst (which must be 0 or 1) is
           included when setting a date which could be in either standard time
           or daylight saving time. It is ignored in all other situations. If
           it is not included, and the resulting date could be in either, it
           will default to standard time.

           The $date object must contain a valid date (unless the entire date
           is being set with $field set to either "zdate" or "date").

           If $field is "zone", the time zone of the date will be set. If ZONE
           is not passed in, it will be set to the local time zone.  When
           setting the time zone, no conversion is done! Whatever date and
           time is stored in the $date object prior to this remains
           unchanged... except it will be that date and time in the new time
           zone.

           If $field is "zdate", the entire date and time zone is set. If ZONE
           is not passed in, it is set to the local time zone.

           If $field is "date", the entire date will be set, but the time zone
           of the date will not be changed.

           If $field is "time", or one of the individual fields, only those
           fields will be modified.

           An error is returned if an invalid argument list is passed in, or
           if the resulting date is checked and found to be invalid.

       value
              $val = $date->value([$type]);
              @val = $date->value([$type]);

           These return the value of the date stored in the object.

           In scalar context, a printable string in the form YYYYMMDDHH:MN:SS
           is returned. In list context, a list is returned of (Y,M,D,H,MN,S).

           If $type is omitted, the date is returned in the time zone it was
           parsed in.

           If $type is "local", it is returned in the local time zone (which
           is either the system time zone, or the zone specified with the
           SetDate or ForceDate config variables).

           If $type is "gmt", the date is returned in the GMT time zone.

           An empty string or list is returned in the case of an error (and an
           error code is set).

       week_of_year
              $wkno = $date->week_of_year([$first]);

           This figures out the week number for the date stored in $date.  It
           uses the config variables FirstDay and Week1ofYear to determine
           this.  For historical reasons, an argument $first may be passed in.
           It must be between 1 and 7 and refers to the first day of the week
           and overrides whatever the FirstDay variable is set to.

           NOTE: This routine should only be called in rare cases.  Use printf
           with the %W, %U, %J, %L formats instead as that will always return
           the correct values for week and year.

           This routine returns a week between 0 and 53 which must then be
           "fixed" to get into the ISO 8601 weeks from 1 to 53.  A date which
           returns a week of 0 actually belongs to the last week of the
           previous year.  A date which returns a week of 53 may belong to the
           first week of the next year.

ISSUES WITH PARSING DATES
       The following issues may occur when parsing dates that should be
       understood to make full use of this module.

       Complete vs. truncated dates and times
           Date formats are either complete or truncated. A complete date
           fully specifies the year, month, and day and a complete time fully
           specifies the hour, minute, and second.

           It should be understood that in many instances, the information may
           be implied rather than explicitly stated, but it is still treated
           as complete.

           For example, the date "January 3" is complete because it implies
           the current year.

           A truncated calendar date or time does not include information
           about some of the fields. Date::Manip will never work with a
           partial date or time, so defaults will be supplied.

           For example, the date "2009-01" is missing a day field, so a
           default will be used. In this case, the day will be the 1st, so
           this is equivalent to "Jan 1st 2009". If only the year is given, it
           will default to Jan 1.

           If the time, or any of it's components is missing, they default to
           00. So the time "12:30" and "12:30:00" are equivalent.

           The "complete" method can be used to check what type of date was
           parsed, and which values were specified (either explicitly or
           implied) and which were provided as a default. It should be noted
           that there is no way to differentiate between an explicit and
           implied value.

           A string with a date and/or time may consist of any of the
           following:

              a complete date and a time (complete or truncated)
              a truncated date with no time
              a time (complete or truncated) with no date

           In other words, the date "Jan 2009 12:30" is not valid since it
           consists of a time with a truncated date.

VALID TIME ZONE FORMATS
       When specifying a time zone, it can be done in three different ways.
       One way is to specify the actual time zone. The second is to supply a
       valid time zone abbreviation. The third is to specify an offset (with
       an optional abbreviation). The following dates illustrate the these
       formats.

       The timezone information always follows the time immediately, and may
       only be included if a time is included. The following examples use an
       ISO 8601 format for the date/time, but any of the other date and time
       formats may be used.

       The first way to specify the time zone is to specify it by complete
       name (or using one of the standard aliases):

          2001-07-01-00:00:00 America/New_York

       Although this is unambiguous when it comes to determining the time
       zone, the time is ambiguous in most zones for one hour of the year.
       When a time change occurs during which the clock is moved back, the
       same wall clock time occurs twice.

       For example, in America/New_York, on Sunday, Nov 2, 2008, at 02:00 in
       the morning, the clock was set back to 01:00. As a result, the date Nov
       2, 2008 at 01:30 is ambiguous. It is impossible to determine if this
       refers to the 01:30 that occurred half an hour before the time change,
       or the one 30 minute after the change.

       In practice, if this form is used, the date will be assigned to
       standard time, meaning that there will be some times (typically 1 hour
       per year) which cannot be expressed this way. As such, this method is
       discouraged.

       The second way to specify the time zone, which is the most common, is
       to use a time zone abbreviation:

          2001-07-01-00:00:00 EDT

       Unfortunately, the abbreviation does not uniquely determine the time
       zone except in a few cases. In order to assign a time zone, Date::Manip
       will refer to a list of all time zones which use the abbreviation.
       They will be tested, in the order given in the Date::Manip::Zones
       documentation, and the first match (i.e. the one in which the given
       date/time and abbreviation are valid) determines the time zone which
       will be used. A great deal of effort has been made to ensure that the
       most likely time zone will be obtained (i.e. the most common time zones
       are tested before less common ones), so in most cases, the desired
       results will be obtained.

       If the default order does not yield the desired time zone, the order of
       testing can be modified using the abbrev method described in the
       Date::Manip::TZ documentation.

       Although the time zone is ambiguous, the date is not, since only time
       zones for which the date are valid will be used.

       The third way to specify the time zone is by specifying an offset and
       an optional abbreviation:

          2001-07-01-00:00:00 -04
          2001-07-01-00:00:00 -0400
          2001-07-01-00:00:00 -040000
          2001-07-01-00:00:00 -04:00
          2001-07-01-00:00:00 -04:00:00

          2001-07-01-00:00:00 -04 (EDT)
          2001-07-01-00:00:00 -0400 (EDT)
          2001-07-01-00:00:00 -040000 (EDT)
          2001-07-01-00:00:00 -04:00 (EDT)
          2001-07-01-00:00:00 -04:00:00 (EDT)

          2001-07-01-00:00:00 -04 EDT
          2001-07-01-00:00:00 -0400 EDT
          2001-07-01-00:00:00 -040000 EDT
          2001-07-01-00:00:00 -04:00 EDT
          2001-07-01-00:00:00 -04:00:00 EDT

       As with the abbreviation, the offset is almost never sufficient to
       uniquely determine the time zone (and it is not even guaranteed that
       both the offset and abbreviation will, though in practice, it is
       probably sufficient). In this instance, the time zone will be
       determined by testing all time zones which have the given offset (and
       abbreviation if it is included) until one is found which matches the
       pieces of information supplied. For more information about how this
       testing is done, refer to the def_zone method of the Date::Manip::TZ
       documentation.

VALID DATE FORMATS
       There are several categories of date formats supported by Date::Manip.
       These are strings which specify only the year/month/day fields.

       These formats explicitly set the date, but not the time. These formats
       may be combined with a time string (as specified below) to set both the
       date and time. If this is not done, the default time is determined by
       the DefaultTime config variable.

       ISO 8601 dates
           The preferred date formats are those specified by ISO 8601. The
           specification includes valid calendar date and valid time formats.
           Date::Manip will handle all of these formats, but does not require
           that the dates rigidly adhere to the specification since the
           ultimate goal of Date::Manip is to handle dates as they are
           represented in real life and some common variations exist which are
           similar to, but not identical to, those from the specification.

           A calendar date includes the following fields:

              CC    2-digit representation of the century
              YY    2-digit representation of the year in
                    a century
              MM    2-digit representation of a month
              DD    2-digit representation of a day of month
              DoY   3-digit representation of a day of year
                    (001-366)
              Www   the character "W" followed by a 2-digit
                    week of the year (01-53)
              D     the day of the week (1-7)

           The following date formats are considered complete by Date::Manip.
           In the following, the date Thu Mar 5 2009 is used as an example.
           This is the 64th day of the year. Thu is the 4th day of the week.
           The week starting Mon, Mar 2 is the 10th week of the year
           (according the the ISO 8601 definition). Obviously, some of the
           formats are only valid when used at some times. For example, the
           format --MMDD refers to a month and day in the current year, so the
           date Mar 5, 2009 can only be specified using this format during
           2009.

              Format      Notes   Examples

              CCYYMMDD            20090305
              CCYY-MM-DD          2009-03-05

              YYMMDD      1,2,4   090305
              YY-MM-DD            09-03-05

              -YYMMDD     3,4     -090305
              -YY-MM-DD           -09-03-05

              --MMDD      1       --0305
              --MM-DD             --03-05

              ---DD       1       ---05


              CCYYDoY             2009064
              CCYY-DoY            2009-064

              YYDoY       1,4     09064
              YY-DoY              09-064

              -YYDoY      3,4     -09064
              -YY-DoY             -09-064

              -DoY        1       -064


              CCYYWwwD            2009W104
              CCYY-Www-D          2009-W10-4

              YYWwwD      1,4     09W104
              YY-Www-D            09-W10-4

              -YYWwwD     3,4     -09W104
              -YY-Www-D           -09-W10-4

              -YWwwD      1       -9W104
              -Y-Www-D            -9-W10-4
                                  Y is the year (0-9) in
                                  current decade

              -WwwD       1       -W104
              -Www-D              -W10-4

              -W-D        1       -W-4
                                  D is day (1-7) in
                                  current week

              ---D        1       ---4
                                  same as -W-D

           The following date formats are truncated:

              CCYY-MM     2       2009-03   (2009-03-01)

              CCYY                2009      (2009-01-01)

              CC          2       20        (2000-01-01)

              -YYMM       4       -0903
              -YY-MM              -09-03

              -YY         4       -09

              --MM                --03

              CCYYWww             2009W10
              CCYY-Www            2009-W10

              YYWww       4       09W10
              YY-Www              09-W10

              -YYWww      3,4     -09W10
              -YY-Www             -09-W10

              -Www                -W10

           Notes:

           1  These formats are considered truncated in the standard, but
           since
              they do include (or imply, using the current date for defaults)
              all of the fields, and since they do not introduce any parsing
              complexities, the standard is relaxed, and they are treated as
              complete.

           2  These formats are treated differently than in Date::Manip 5.xx
           as
              described below.

           3  These formats are not defined in the ISO 8601 spec, but
              are added for the sake of completeness since they do not
              add any parsing incompatibilities.

           4  Formats where the century is not given are described as a year
           in
              the current century in the specification. Date::Manip treats
           this
              more generically using the YYtoYYYY config variable. This will
           be
              used to determine how to determine the full year.

           Date::Manip 5.xx handled ISO 8601 dates in a less rigid fashion,
           and deviated from the specification in several formats. As of 6.00,
           the specification is followed much more closely so that all of the
           date formats included in it should produce valid dates.  This
           changes, in a backwards incompatible way, the way a few strings
           will be interpreted as dates.

           As of 6.00, a two-digit date will be treated as CC. Previously, it
           was treated as YY.

           A six-digit date will be treated as YYMMDD. Previously, it was
           treated as YYYYMM.

           Previously, dashes were treated as optional in many cases.
           According to the specification, dates may be written in expanded
           form (with all dashes present) or abbreviate form (with no dashes).
           As of 6.00, this is the behavior, so the formats: YYMMDD and YY-MM-
           DD are allowed, as per the specification, but the format YY-MMDD is
           NOT allowed (though it was previously).

           The Www-D formats require a bit of explanation.  According to the
           specification, the date:

              1996-w02-3

           refers to the day with an ordinal number of 3 within the calendar
           week in the 2nd week of 1996.

           In the specification, the days of the week are numbered from 1 to 7
           (Monday to Sunday), and the week always begins on Monday, so day 1
           (Monday) is always the first day of the week, day 2 (Tuesday) is
           always the second day of the week, etc.

           In Date::Manip, the constraint that the week must start with Monday
           is relaxed, allowing the week to begin with Sunday (a far more
           common start of the week in calendars, at least in some parts of
           the world).

           This presents a problem though in that the above date could be
           interpreted as Wednesday (day 3) of the 2nd week of 1996, or as the
           3rd day of the 2nd week of 1996 (which would normally be Wednesday,
           but would be Tuesday if the week begins on Sunday).

           As of Date::Manip 6.00, the above date will be interpreted as the
           3rd day of the 2nd week. This is a reversal from Date::Manip 5.xx,
           but I believe is what the specification would require. For more
           information, refer to the Date::Manip::Changes document.

       Common date formats
           Date::Manip supports a number of common date formats. The following
           fields may be included in a date:

             YY    2-digit representation of the year
             YYYY  4-digit representation of the year
             M     1- or 2- digit representation of the month
             MM    2-digit representation of the month
             D     1- or 2- digit representation of the day
             DD    2-digit representation of the day
             mmm   The abbreviated or full month name (i.e. Jan)

           The following date formats are supported:

              Format      Notes   Examples

              M/D         1,2,3   3/5
              M/D/YY      1       3/5/09
              M/D/YYYY    1       3/5/2009

              YYYY/M/D            2009/3/5

              mmm/D               Mar/5
              mmm/D/YY            Mar/5/09
              mmm/D/YYYY          Mar/5/2009
              D/mmm               5/Mar
              D/mmm/YY            5/Mar/09
              D/mmm/YYYY          5/Mar/2009
              YYYY/mmm/D          2009/Mar/5

              mmmD                Mar5
              mmmDDYY     4       Mar0509
              mmmDDYYYY           Mar052009
              Dmmm                5Mar
              DmmmYY              5Mar09
              DmmmYYYY            5Mar2009
              YYYYmmmD            2009Mar5

              mmmD YY             Mar5 09
              mmmD YYYY           Mar5 2009
              Dmmm YY             5Mar 09
              Dmmm YYYY           5Mar 2009

              mmm/D YY            Mar/5 09
              mmm/D YYYY          Mar/5 2009
              D/mmm YY            5/Mar 09
              D/mmm YYYY          5/Mar 2009

              YY   mmmD           09   Mar5
              YYYY mmmD           2009 Mar5
              YY   Dmmm           09   5Mar
              YYYY Dmmm           2009 5Mar

              YY   mmm/D          09   Mar/5
              YYYY mmm/D          2009 Mar/5
              YY   D/mmm          09   5/Mar
              YYYY D/mmm          2009 5/Mar

              YYYY:MM:DD          2010:01:15 (EXIF format)

              mmmYYYY     4       Jun 2010
              YYYYmmm     4       2010 June
              mmm/YYYY    4       Jun/2010
              YYYY/mmm    4       2010/Jun

           In the formats above, the slash (/) can be replace by any of the
           valid separators: whitespace, slash (/), period (.), or dash (-).
           The dash, though allowed, is discouraged since it may conflict with
           an ISO 8601 format.  For example, the format MM/DD/YY is just fine,
           but MM-DD-YY does not work since it conflicts with YY-MM-DD.  To be
           safe, if "-" is used as a separator in a non-ISO format, they
           should be turned into "/" before calling the Date::Manip routines
           or you should use the 'noiso8601' option with the parse or
           parse_date methods.

           No matter what separator is used, the same separator must be used
           throughout the date. For example, MM/DD/YY is valid and MM.DD.YY is
           also valid, but MM/DD.YY is NOT valid.

           Notes:

           1  With these formats, Americans tend to write month first, but
           many
              other countries tend to write day first.  The latter behavior
           can be
              obtained by setting the config variable DateFormat to something
           other
              than "US".

           2  The dot (.) separator may not be used in the M/D format since it
              will be interpreted as the H12,H+ format described below.

           3  The M/D format should not use the period (.) separator as that
           will
              incorrectly match the HH,H+ time format.

           4  Historically, I have not supported partial dates (i.e. dates
           that
              were not fully specified), but it has been argued that something
           like
              'Jun 1910' would be interpreted by almost everyone as a day in
           June
              of 1910 instead of June 19, 2010.  And it has been shown that in
              some applications, dates are specified in that way.  I have
           added the
              new config variable Format_MMMYYYY which will change this.  If
           this
              variable is not set, the formats allowed are:

                 mmmDDYY

              If it is set, the formats allowed are:

                 mmmYYYY
                 YYYYmmm

              The day of week may not be included with these formats.  When
              parsing a full date/time, if Format_MMMYYYY is set to 'first',
              it returns the 1st of the month at midnight.  If it is set to
              'last', it returns the last day at 23:59:59.  If parsing only
              only a date, it will be set to the first or last day of the
              month at midnight.

           These formats explicitly set the date, but not the time. The
           default time is determined by the DefaultTime config variable.

       Less common date formats
           The following formats are also supported by Date::Manip:

              DoW
                   The day of week of the current week
                      Friday
                      Friday at 12:40

              MMM Nth [YYYY]
              Nth MMM [YYYY]
              YYYY MMM Nth
              YYYY Nth MMM
                   Dec 1st 1970
                   1st Dec 1970
                   1970 Dec 1st
                   1970 1st Dec

              next/prev DoW
                   The next or last occurrence of DoW
                      next Friday
                      last Friday at 12:40

              next/last week/month/year
                   The day one week/month/year from now
                   or in the past
                      next week
                      last month at 15:00

              last day in MMM [YYYY]
                   The last day of the month
                      last day in October
                      last day in October 1996

              last DoW in MMM [YYYY]
                   The last DoW in the month
                      last Tuesday in October
                      last Tuesday in October 1996

              last DoW in YYYY
                   The last DoW in the year
                      last Tuesday in 1997

                      NOTE: "last DoW" doesn't work in
                      English since the word "last"
                      is used for both this expression
                      and for "prev DoW", which gets
                      parsed first. "last DoW" MAY
                      work in other languages.

              Nth DoW in MMM [YYYY]
                   The Nth DoW in the month
                      3rd Tuesday in October
                      3rd Tuesday in October 1996

              Nth DoW [YYYY]
                   The Nth DoW in the year
                      22nd Sunday
                      22nd Sunday in 1996

              Nth day in MMM [YYYY]
                   The Nth day of the month
                      1st day of February
                      1st day of February 2012

              DoW week
                   British: same as "in 1 week on DoW"
                      Monday week

              DoW week N [YYYY]
              Dow Nth week [YYYY]
                   Sunday week 22
                   Sunday 22nd week
                      These refer to the day of week
                      of the Nth week of the year.

              Nth
                   12th
                      This refers to the Nth day of the
                      current month.

           Note that the formats "Sunday week 22" and "22nd Sunday" give
           different behaviors.  "Sunday week 22" returns the Sunday of the
           22nd week of the year based on how week 1 is defined.  ISO 8601
           defines week one to contain Jan 4, so "Sunday week 1" might be the
           first or second Sunday of the current year, or the last Sunday of
           the previous year.  "22nd Sunday" gives the actual 22nd time Sunday
           occurs in a given year, regardless of the definition of a week.

       Special date strings
           Most languages have strings which can be used to specify the date
           (relative to today). In English, these include the strings:

              today
              tomorrow
              yesterday

           There is also support for the British formats:

              today week
              tomorrow week
              yesterday week

           which refer to one week after today/tomorrow/yesterday
           respectively.

           Other languages have similar strings.

       Holidays
           You can parse holiday names as dates (including timezones).  For
           example:

              Christmas
              Christmas 2010
              Christmas 2010 at noon
              Christmas 2010 at noon PST
              Saturday Christmas 2010 at noon

       In all of the formats (except for ISO 8601 formats), the day of week
       ("Friday") can be entered anywhere in the date and it will be checked
       for accuracy.  In other words,

         "Tue Jul 16 1996 13:17:00"

       will work but

         "Jul 16 1996 Wednesday 13:17:00"

       will not (because Jul 16, 1996 is Tuesday, not Wednesday).

A NOTE ABOUT FOREIGN LANGUAGE DATES
       Although Date::Manip has some support for parsing dates in foreign
       languages, it must be noted that the formats supported are largely
       based on English equivalents.

       There are probably many different dates that are perfectly valid, and
       in common usage, in other languages which do not have an equivalent in
       the English language, and unfortunately, Date::Manip will probably not
       parse these.

       You are free to send these to me, and I'll see if there is a way to add
       them in, but I do not guarantee anything.  Without having a full-blown
       language parser (or at least the portion of the language that is
       devoted to calendar and time), most of these formats will simply not be
       supportable.

VALID TIME FORMATS
       There are several categories of time formats supported by Date::Manip.
       These are strings which specify only the hour/minute/second fields.

       ISO 8601 times
           A time may be also be complete or truncated.  Again, Date::Manip
           treats some formats as complete even though the specification calls
           them truncated.

           A time may include the following fields:

              HH    2-digit representation of the hour
              MN    2-digit representation of the minutes
              SS    2-digit representation of the seconds
              H+    1+ digit representation of fractional hours
              M+    1+ digit representation of fractional minutes
              S+    1+ digit representation of fractional seconds

           The following time formats are considered complete by Date::Manip.
           The time 12:30:15 will be expressed in the examples.

              Format      Notes   Examples

              HHMNSS      2       123015

              HH:MN:SS            12:30:15

              HHMNSS,S+           123015,5
              HH:MN:SS,S+         12:30:15,5
                                  Fractional seconds are ignored

              HHMN,M+             1230,25
              HH:MN,M+            12:30,25
                                  This is 12:30:00 + 0.25 minutes

              HH,H+               12,5
                                  This is 12:00:00 + 0.5 hours, so
                                  this is equivalent to 12:30:00

              -MNSS       1       -3015
              -MN:SS              -30:15

              --SS        1       --15

              -MNSS,S+    1       -3015,5
              -MN:SS,S+           -30:15,5

              -MN,M+      1       -30,25

              --SS,S+     1       --15,5

              HHMN        3       1230
              HH:MN               12:30

           The following time formats are truncated:

              HH                  12

              -MN                 -30

           Notes:

           1  These formats are considered truncated in the standard, but
           since
              they do include (or imply, using the current time for defaults)
           all of
              the fields, and since they do not introduce any parsing
           complexities,
              the standard is relaxed, and they are treated as complete.

           2  The HHMNSS format will not be correctly parsed since it is
           impossible
              to distinguish between it and YYMMDD. In order to parse an all-
           digit
              time, add the string ",0" to the end to force it to be
           interpreted
              as a time or include time zone information (either a zone name
           or
              abbreviation... an offset will not work in this case).

           3  The HH:MN format will be treated as complete, even though it is
              incomplete due to missing the seconds. In real life, expressing
              a time in the HH:MN format is very common, and is regarded as
           complete,
              and might include time zone information.

           ISO 8601 times may be followed by a time zone unless they are
           truncated.  Truncated times may not include a timezone.
           Date::Manip relaxes the constraints placed on the time zone format
           and allows any of the methods used to specify the time zone
           including time zone name, abbreviation, or offset. The time zone
           may be separated from the time by a space, but it is not required.

           Another constraint that is relaxed is that the fractional part may
           be specified using a period. In other words, the following are
           equivalent:

              12:30,25
              12:30.25

           It should be noted (as it is in the specification) that using a
           negative time zone offset may cause confusion. In addition to
           visually confusing, it may not be parsed correctly. For example,
           the time:

              123005-0300

           may not be parsed correctly. When using an offset time zone, you
           should always use the colon separators in the time:

              12:30:05-0300

       Other time formats
           A time may include any of the following fields:

              H24   1- or 2-digit representation of the hour (0-23)
              H12   1- or 2-digit representation of the hour (1-12)
              MN    2-digit representation of the minutes
              SS    2-digit representation of the seconds
              H+    1+ digit representation of fractional hours
              M+    1+ digit representation of fractional minutes
              S+    1+ digit representation of fractional seconds
              AM    A language specific AM/PM string

           The following time formats are accepted:

              Format              Examples

              H24:MN:SS           17:30:15
              H12:MN:SS AM        5:30:15 PM
              H12:MN:SS

              H24:MN:SS,S+        17:30:15,5
              H12:MN:SS,S+ AM     5:30:15,5 PM
              H12:MN:SS,S+        Fractional seconds are ignored

              H24:MN,M+           17:30,25
              H12:MN,M+ AM        5:30,25 PM
              H12:MN,M+           This is 17:30:00 + 0.25 minutes

              H24,H+              17,5
              H12,H+ AM           5,5 PM
              H12,H+              This is 17:00:00 + 0.5 hours, so
                                  this is equivalent to 17:30:00

              H24:MN              17:30
              H12:MN AM           5:30 PM
              H12:MN

              H12 AM              5 PM

           The fractional part may be specified using a comma or a period.
           Fractional seconds may also be separated using a colon.  A language
           specific fractional separator may also be available for some
           languages.

           In other words, the following are equivalent:

              12:30:20,25
              12:30:20.25
              12:30:20:25

           Some languages have alternate H:MN and MN:S separators. For
           example, one H:MN separator in French is 'h' (the MN:S separator is
           still a colon), so the following are equivalent:

              12:30:00
              12h30:00

           Time zone information can be included immediately following the
           time.  It can be separated by whitespace from the time, or it can
           be immediately adjacent.

       Special time strings
           Different languages may have some words which can be used to
           specify a certain time of day. In English, for example, the
           following words are equivalent to the time listed:

              noon        12:00:00
              midnight    00:00:00

           So, the following are equivalent:

              Jan 2 2009 at noon
              Jan 2 2009 12:00:00

           There were two possible ways to interpret midnight. One was at the
           start of the day (00:00:00) and the other was at the end of the day
           (24:00:00 which would actually mean at 00:00:00 of the following
           day).  The first has been used to maintain backwards compatibility
           with Date::Manip 5.xx .

           Other languages have similar strings.

       In most languages, a word similar to "at" may precede the time (this
       does NOT apply to ISO 8601 time formats). This word (which must be
       separate from all other parts of the date with whitespace) is optional,
       and the following are equivalent:

          12:30
          at 12:30

       The times "12:00 am", "12:00 pm", and "midnight" are not well defined.
       Date::Manip uses the following convention:

         midnight = 12:00am = 00:00:00
         noon     = 12:00pm = 12:00:00

       and the day goes from 00:00:00 to 23:59:59.  In other words, midnight
       is the beginning of a day rather than the end of one.  The time
       24:00:00 is also allowed (though it is automatically transformed to
       00:00:00 of the following day). This gives the unusual result of
       parsing:

         Wed Feb 8 2006 24:00:00

       which gives the date of:

         Thu Feb 9 2006 00:00:00

VALID COMBINED DATE AND TIME FORMATS
       There are several categories of strings which specify both the date and
       time. These include the following:

       ISO 8601 combined date and time
           A combined ISO 8601 date and time is a string containing a complete
           ISO 8601 date and a complete or truncated ISO 8601 time.  It may
           also include a timezone, provided a complete time is included.

           Date::Manip relaxes the restrictions on how the two are combined.
           The time may be separated from the date by space, dash, or the
           letter T, or the two may be joined with nothing separating them.

           When the time immediately follows the date, or when the two are
           separated by a dash, the resulting string MUST be unambiguous.
           Provided the date includes all of the dashes in it (i.e. YY-MM-DD
           instead of YYMMDD), it is rare that there is any ambiguity. If the
           date does not include dashes, the strings may be ambiguous, and in
           this case, separating the date and time with a space or the letter
           T is useful (and perhaps necessary) to correctly interpret the
           string.

           The DoY formats should always be separated from the time by
           something. They are visually confusing if they are not separated
           from the time.

           Time zone information can be included immediately following a
           complete time.  It may not be included if no time is given, or if a
           truncated time is included. The time zone may be separated from the
           time with whitespace, or it can be immediately adjacent to it
           (since the ISO 8601 specification allows it in some cases).

       Non-ISO 8601 combined date and time
           A date from any of the non-ISO 8601 formats above may be combined
           with any of the non-ISO 8601 time formats above in any combination
           to form a valid combined date and time.

       Deltas
           Dates are often specified in terms of a delta from "now". For
           example, "in 2 days".

           Most valid deltas can be used to specify a date, and the date is
           defined as that delta added to "now". Refer to the
           Date::Manip::Delta documentation for a list of valid delta formats.

           If the delta itself does not include a time part, the time may be
           specified explicitly. For example:

              in 3 days at 12:00:00
              in 3 days at 12:00:00 PST

           will take the delta part "in 3 days" and add it to the current
           time, then set the time to 12:00:00.

           It is NOT allowed to include an explicit time if any time segment
           was included in the delta. For example, the following is invalid:

              in 3 days 2 hours at 12:00:00

           One additional format that is supported is to include only week (or
           higher) components in the delta and to set the day of week. For
           example:

             Friday in 2 weeks
             in 2 weeks on Friday
             Friday 2 weeks ago
             2 weeks ago on Friday at 13:45

           These first apply the delta (of weeks, months, and years) to the
           current time, and then set the day to the given day-of-week in that
           week.

       Special date and time strings
           Most language have strings which can be used to specify the full
           date and time (relative to the current date and time). In English,
           these include the string:

              now

           They may also have a timezone attached:

              now PST

       Additional combined date and time formats
           The following formats are also supported:

              epoch SECS
                 The number of seconds since the epoch
                 (Jan 1, 1970 00:00:00 GMT). SECS may
                 be negative to give time before the
                 epoch.

           or

              epoch SECS TIMEZONE

       A couple of notes:

       Commas may be included in all date formats arbitrarily (except for ISO
       8601 formats where they may only be included when allowed by the
       specification).

       The time/time zone is removed from the date before the date is parsed,
       so the time may appear before or after the date, or between any two
       parts of the date.

       The time and the zone do not need to be adjacent, so the string:

          Jan 21 17:13:27 2010 -0400

       will work.  If the timezone is separate from the date, it MUST be
       separated from any other portion of the date by whitespace.

       Certain words such as "on", "in", "at", "of", etc. which commonly
       appear in a date or time are ignored (except in ISO 8601 formats).

PRINTF DIRECTIVES
       The following printf directives are replaced with information from the
       date.  These all assume that the Use_POSIX_Printf config variable is
       unset.  If it is set, refer to POSIX PRINTF DIRECTIVES section below.

          Year
              %y     year                     - 00 to 99
              %Y     year                     - 0001 to 9999

          Month, Week
              %m     month of year            - 01 to 12
              %f     month of year            - " 1" to "12"
              %b,%h  month abbreviation       - Jan to Dec
              %B     month name               - January to December

          Day
              %j     day of the year          - 001 to 366
              %d     day of month             - 01 to 31
              %e     day of month             - " 1" to "31"
              %v     weekday abbreviation     - " S"," M"," T", ...
              %a     weekday abbreviation     - Sun to Sat
              %A     weekday name             - Sunday to Saturday
              %w     day of week              - 1 to 7 (1=Monday)
              %E     day of month with
                     suffix                   - 1st, 2nd, 3rd...

          Hour
              %H     hour                     - 00 to 23
              %k     hour                     - " 0" to "23"
              %i     hour                     - " 1" to "12"
              %I     hour                     - 01 to 12
              %p     AM or PM

          Minute, Second, Time zone
              %M     minute                   - 00 to 59
              %S     second                   - 00 to 59
              %Z     time zone abbreviation   - EDT
              %z     time zone as GMT offset  - +0100 (see Note 4)
              %N     time zone as GMT offset  - +01:00:00

          Epoch (see NOTE 3 below)
              %s     seconds from
                     1/1/1970 GMT             - negative if before
              %o     seconds from 1/1/1970
                     in the current time
                     zone

          Date, Time
              %c     %a %b %e %H:%M:%S %Y     - Fri Apr 28 17:23:15 1995
              %C,%u  %a %b %e %H:%M:%S %Z %Y  - Fri Apr 28 17:25:57 EDT 1995
              %g     %a, %d %b %Y %H:%M:%S %Z - Fri, 28 Apr 1995 17:23:15 EDT
              %D     %m/%d/%y                 - 04/28/95
              %x     %m/%d/%y or %d/%m/%y     - 04/28/95 or 28/04/95
                                                (Depends on DateFormat variable)
              %l     date in ls(1) format (see NOTE 1 below)
                       %b %e %H:%M            - Apr 28 17:23 (*)
                       %b %e  %Y              - Apr 28  1993 (*)
              %r     %I:%M:%S %p              - 05:39:55 PM
              %R     %H:%M                    - 17:40
              %T,%X  %H:%M:%S                 - 17:40:58
              %V     %m%d%H%M%y               - 0428174095
              %Q     %Y%m%d                   - 19961025
              %q     %Y%m%d%H%M%S             - 19961025174058
              %P     %Y%m%d%H:%M:%S           - 1996102517:40:58
              %O     %Y-%m-%dT%H:%M:%S        - 1996-10-25T17:40:58
              %F     %A, %B %e, %Y            - Sunday, January  1, 1996
              %K     %Y-%j                    - 1997-045

          Special Year/Week formats (see NOTE 2 below)
              %G     year, Monday as first
                     day of week              - 0001 to 9999
              %W     week of year, Monday
                     as first day of week     - 01 to 53
              %L     year, Sunday as first
                     day of week              - 0001 to 9999
              %U     week of year, Sunday
                     as first day of week     - 01 to 53
              %J     %G-W%W-%w                - 1997-W02-2

          Other formats
              %n     insert a newline character
              %t     insert a tab character
              %%     insert a `%' character
              %+     insert a `+' character

          All other characters are currently unused, but may be used in the
          future.  They currently insert the character following the %.

          The following multi-character formats also exist:

          Extended formats
              %   These returns the NUMth value of the %A, %a, and %v formats
              %   respectively.  In English, that would yield:
              %      %   => Tuesday
                            %   => Tue
                            %   => T
                         NUM must be in the range 1-7.

              %   These return the NUMth value of the %B and %b formats
              %   respectively.  In English, that would yield:
                            %   => February
                            %   => Feb
                         NUM must be in the range 1-12 (or 01-12).

              %   These return the NUMth value of the %p format.  In
                         English, that would yield:
                            %   => AM
                            %   => PM
                         NUM must be in the range 1-2.

              %   These return the NUMth value of the %E format.  In
                         English, that would yield:
                            %   => 1st
                            %  => 53rd
                         NUM must be in the range 1-53.

       If a lone percent is the final character in a format, it is ignored.

       The formats used in this routine were originally based on date.pl
       (version 3.2) by Terry McGonigal, as well as a couple taken from
       different versions of the Solaris date(1) command.  Also, several have
       been added which are unique to Date::Manip.

       NOTE 1:

       The ls format (%l) applies to date within the past OR future 6 months!
       Any date that is before the date NOW - 6 months, or that is on or after
       the date NOW + 6 months will have the year printed out.

       The later time must be on or after so that there is no ambiguity. If it
       is now 2000-06-06-12:00:00, then the date 1999-12-06-12:00:00 will be
       written as "Dec 6 12:00" but the date 2000-12-06-12:00:00 will be
       written as "Dec 6 2000".

       NOTE 2:

       The %U, %W, %L, %G, and %J formats are used to support the ISO-8601
       format: YYYY-wWW-D.  In this format, a date is written as a year, the
       week of the year, and the day of the week.  Technically, the week may
       be considered to start on any day of the week, but Sunday and Monday
       are both common choices, so both are supported.

       The %W and %G formats return the week-of-year and the year treating
       weeks as starting on Monday.

       The %U and %L formats return the week-of-year and the year treating
       weeks as starting on Sunday.

       Most of the time, the %L and %G formats returns the same value as the
       %Y format, but there is a problem with days occurring in the first or
       last week of the year.

       The ISO-8601 representation of Jan 1, 1993 written in the YYYY-wWW-D
       format is actually 1992-W53-5.  In other words, Jan 1 is treated as
       being in the last week of the preceding year.  Depending on the year,
       days in the first week of a year may belong to the previous year, and
       days in the final week of a year may belong to the next year.  The week
       is assigned to the year which has most of the days.  For example, if
       the week starts on Sunday, then the last week of 2003 is 2003-12-28 to
       2004-01-03.  This week is assigned to 2003 since 4 of the days in it
       are in 2003 and only 3 of them are in 2004.  The first week of 2004
       starts on 2004-01-04.

       The %U and %W formats return a week-of-year number from 01 to 53. %L
       and %G return the corresponding year, and to get this type of
       information, you should always use the (%W,%G) combination or (%U,%L)
       combination. %Y should not be used as it will yield incorrect results.

       %J returns the full ISO-8601 format (%G-W%W-%w).

       NOTE 3:

       The %s and %o formats return negative values if the date is before the
       start of the epoch.  Other Unix utilities would return an error, or a
       zero, so if you are going to use Date::Manip in conjunction with these,
       be sure to check for a negative value.

       NOTE 4:

       The %z format returns the offset in the RFC 822 specified format +0500
       .  Most offsets are full hour amounts, so this is not a problem, but
       some offsets are irregular (+05:17:30). In this case, the string
       returned is +051730 which isn't RFC 822 compliant, but since RFC 822
       ignores this situation, I had to decide between returning an incorrect
       value, or breaking strict compliance, and I chose the second option.

POSIX PRINTF DIRECTIVES
       For various reasons, a few of the printf directives in the
       Date::Manip::Date::printf method do not match the standard POSIX
       strftime directives.  For backward compatibility reasons, I'm not going
       to change that.  However, the Use_POSIX_Printf config variable can be
       set to 1 to use the POSIX formats instead of the default formats.

       When that variable is set, most of the printf formats described above
       are used, but the formats are replaced with their POSIX value:

          %C   The century number (first two digits of the year).

          %F   This is equivalent to %Y-%m-%d

          %l   The hour (12-hour clock) padded with spaces

          %P   Either 'am' or 'pm'.

          %u   Day of week from 1-7 with Monday being 1.

          %G   Similar to the %G format described above, but strictly adheres
               to the ISO 8601 week definition where the first week of
               the week is Monday and the first week of the year contains
               Jan 4.

          %g   Identical to %g but only has the last two digits of the year.

          %W   Similar to the %W format described above, but with Monday
               being the first day of the week and the first Monday in the
               year being the first day of the first week.

          %V   Similar to the %W format described above, but strictly adheres
               to the ISO 8601 week definition where the first week of
               the week is Monday and the first week of the year contains
               Jan 4.

          %L   The strftime function does not have a %L directive.  I have
               set it anyway to be similar to the %L format above except
               using Sunday as the first day of the week and the first week
               of the year contains Jan 4 (so this is the equivalent of %G
               but with Sunday being the first day of the week).

          %U   Similar to the %U format described above but with Sunday being
               the first day of the week and the first Sunday being the first
               day of the first week.

          %J   The strftime function does not have a %J directive, but in
               order to support the ISO 8601 YYYY-wWW-D format, this is
               equivalent to '%G-W%V-%w'.

       Note 1: The default (i.e. non-POSIX) Date::Manip printf formats are
       defined so that %G and %W use the exact same definition of week and
       likewise %L and %U use the same definition of weeks.  This means that
       you can use them to write a date in an ISO 8601 YYYY-wWW format.  In
       the POSIX strftime definitions, %G and %V work together, but there is
       no equivalent pair for Sunday being the first day of the week.

       The following POSIX strftime directives are not yet supported (though
       they may be in a future version of Date::Manip).  These will continue
       to return the values listed above from the non-POSIX formats.

          %c, %x, %X
               The strftime format give the preferred date/time representations
               in the current locale.

               Currently Date::Manip does not make use of locale information
               so there is no locale-specific format.

               The default format (which is the preferred date and time
               format in America) is used in all locales.

          %E, %O
               Modifiers to create additional directives.

          %+   Date and time in the format of the date command

KNOWN BUGS
       None known.

BUGS AND QUESTIONS
       Please refer to the Date::Manip::Problems documentation for information
       on submitting bug reports or questions to the author.

SEE ALSO
       Date::Manip        - main module documentation

LICENSE
       This script is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

AUTHOR
       Sullivan Beck (sbeck@cpan.org)

perl v5.38.2                      2024-03-03              Date::Manip::Date(3)