DYSIZE(3)

NAME
dysize - get number of days for a given year

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
 | Thread safety | MT-Safe

CONFORMING TO
This function occurs in SunOS 4.x.

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

SEE ALSO
strftime(3)

COLOPHON
This page is part of release 4.16 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.