dysize(3) - Linux manual page (original) (raw)

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)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **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)](../man3/strftime.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 dysize(3)