Manpages - dysize.3

dysize - get number of days for a given year

  #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).

This function occurs in SunOS 4.x.

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

*strftime*(3)

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