Man page - dysize(3)

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dysize - get number of days for a given year

Standard C library ( libc , -lc )

#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

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> .

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

Image grohtml-113117-1.png

None.

SunOS 4.x.

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