This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

gettimeofday — get the date and time

#include <sys/time.h>
int gettimeofday(struct timeval *restrict tp, void *restrict tzp);

The gettimeofday() function shall obtain the current time, expressed as seconds and microseconds since the Epoch, and store it in the timeval structure pointed to by tp. The resolution of the system clock is unspecified.

If tzp is not a null pointer, the behavior is unspecified.

The gettimeofday() function shall return 0 and no value shall be reserved to indicate an error.

No errors are defined.

The following sections are informative.


Applications should use the clock_gettime() function instead of the obsolescent gettimeofday() function.


The gettimeofday() function may be removed in a future version.

clock_getres(), ctime()

The Base Definitions volume of POSIX.1‐2017, <sys_time.h>

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at .

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2017 IEEE/The Open Group