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DYSIZE(3) Linux Programmer's Manual 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   |
     +----------+---------------+---------+
     |dysize()  | 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/.

GNU 2016-03-15 DYSIZE(3)