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+.\"  Copyright 2001 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\" 
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\" 
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.\" aeb: some corrections
+.TH DYSIZE 3 "November 12, 2001" "GNU" "Linux Programmer's Manual"
+.SH NAME
+dysize \- get number of days for a given year
+.SH SYNOPSIS
+.sp
+.BR "#define _BSD_SOURCE" "   /* or: #define _SVID_SOURCE */
+.br
+.BR "#include <time.h>
+.sp
+.BI "int dysize(int " year );
+.sp
+.SH DESCRIPTION
+The function returns 365 for a normal year and 366 for a leap year.
+The calculation for leap year is based on:
+.sp
+(year) %4 == 0 && ((year) %100 != 0 || (year) %400 == 0)
+.sp
+The formula is defined in the macro
+.I __isleap(year)
+also found in
+.IR <time.h> .
+.SH "CONFORMING TO"
+This function occurs in SunOS 4.x.
+.SH NOTES
+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),
+.BR time (3)