dysize(3)                  Library Functions Manual                  dysize(3)

NAME
       dysize - get number of days for a given year

LIBRARY
       Standard C library (libc, -lc)

SYNOPSIS
       #include <time.h>

       int dysize(int year);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       dysize():
           Since glibc 2.19:
               _DEFAULT_SOURCE
           glibc 2.19 and earlier:
               _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION
       The function returns 365 for a normal year and 366 for a leap year.
       The calculation for leap year is based on:

           (year) %4 == 0 && ((year) %100 != 0 || (year) %400 == 0)

       The formula is defined in the macro __isleap(year) also found in
       <time.h>.

ATTRIBUTES
       For an explanation of the terms used in this section, see
       attributes(7).

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |dysize ()                                   | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+
STANDARDS
       None.

HISTORY
       SunOS 4.x.

       This is a compatibility function only.  Don't use it in new programs.

SEE ALSO
       strftime(3)

Linux man-pages 6.7               2023-10-31                         dysize(3)