mirror of https://github.com/mkerrisk/man-pages
87 lines
2.3 KiB
Groff
87 lines
2.3 KiB
Groff
.\" Copyright 2001 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" aeb: some corrections
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.TH DYSIZE 3 2021-03-22 "GNU" "Linux Programmer's Manual"
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.SH NAME
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dysize \- get number of days for a given year
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.SH SYNOPSIS
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.nf
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.B "#include <time.h>"
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.PP
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.BI "int dysize(int " year );
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.fi
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.PP
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.RS -4
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.RE
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.PP
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.BR dysize ():
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.nf
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Since glibc 2.19:
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_DEFAULT_SOURCE
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Glibc 2.19 and earlier:
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_BSD_SOURCE || _SVID_SOURCE
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.fi
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.SH DESCRIPTION
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The function returns 365 for a normal year and 366 for a leap year.
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The calculation for leap year is based on:
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.PP
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.in +4n
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.EX
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(year) %4 == 0 && ((year) %100 != 0 || (year) %400 == 0)
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.EE
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.in
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.PP
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The formula is defined in the macro
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.I __isleap(year)
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also found in
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.IR <time.h> .
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.nh
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.TS
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allbox;
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lbx lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR dysize ()
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T} Thread safety MT-Safe
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.TE
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.hy
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.ad
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.sp 1
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.SH CONFORMING TO
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This function occurs in SunOS 4.x.
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.SH NOTES
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This is a compatibility function only.
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Don't use it in new programs.
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.\" The SCO version of this function had a year-2000 problem.
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.SH SEE ALSO
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.BR strftime (3)
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