dysize - get number of days for a given year

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

       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>.

       SunOS 4.x.

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

       Standard C library (libc, -lc)

       dysize - get number of days for a given year

strftime(3)

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

       None.

#include<time.h>intdysize(intyear);

   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