| .\" Copyright 2001 Walter Harms (walter.harms@informatik.uni-oldenburg.de) |
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| .\" aeb: some corrections |
| .TH DYSIZE 3 2016-03-15 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| dysize \- get number of days for a given year |
| .SH SYNOPSIS |
| .B "#include <time.h>" |
| .PP |
| .BI "int dysize(int " year ); |
| .PP |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .PP |
| .BR dysize (): |
| Since glibc 2.19: |
| _DEFAULT_SOURCE |
| Glibc 2.19 and earlier: |
| _BSD_SOURCE || _SVID_SOURCE |
| .SH DESCRIPTION |
| The function returns 365 for a normal year and 366 for a leap year. |
| The calculation for leap year is based on: |
| .PP |
| .in +4n |
| .EX |
| (year) %4 == 0 && ((year) %100 != 0 || (year) %400 == 0) |
| .EE |
| .in |
| .PP |
| 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; |
| lb lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR dysize () |
| T} Thread safety MT-Safe |
| .TE |
| .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) |