dysize(3) — Linux manual page

dysize(3)               Library Functions Manual               dysize(3)

NAME         top

       dysize - get number of days for a given year

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #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         top

       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         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ dysize()                            │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

STANDARDS         top

       None.

HISTORY         top

       SunOS 4.x.

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

SEE ALSO         top

       strftime(3)

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                      dysize(3)

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