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'\" t
.\" Copyright 2001 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.\" aeb: some corrections
.TH dysize 3 2023-10-31 "Linux man-pages 6.7"
.SH NAME
dysize \- get number of days for a given year
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.B "#include <time.h>"
.P
.BI "int dysize(int " year );
.fi
.P
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.P
.BR dysize ():
.nf
Since glibc 2.19:
_DEFAULT_SOURCE
glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE
.fi
.SH DESCRIPTION
The function returns 365 for a normal year and 366 for a leap year.
The calculation for leap year is based on:
.P
.in +4n
.EX
(year) %4 == 0 && ((year) %100 != 0 || (year) %400 == 0)
.EE
.in
.P
The formula is defined in the macro
.I __isleap(year)
also found in
.IR <time.h> .
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.na
.nh
.BR dysize ()
T} Thread safety MT-Safe
.TE
.SH STANDARDS
None.
.SH HISTORY
SunOS 4.x.
.P
This is a compatibility function only.
Don't use it in new programs.
.\" The SCO version of this function had a year-2000 problem.
.SH SEE ALSO
.BR strftime (3)
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