dysize - get number of days for a given year
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
This function occurs in SunOS 4.x.
This is a compatibility function only. Don't use it in new programs.
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