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<html><!-- Mirrored from c-faq.com/lib/calendar.br.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 08:01:39 GMT --><head><title></title></head><body>From: Branko Radovanovic<br>Subject: Day difference between two dates<br>Message-ID: <199602161231.NAA18023@pinus.cc.etf.hr><br>Date: Fri, 16 Feb 1996 13:31:39 +0100<p>I suggest the following code for solving both the problem ofcomputing the day difference between two dates, and the problemof determining day of week on a given date :<p><pre>#define DayOfWeek(d,m,y) (int)(DaysElapsed(d,m,y) % 7)long DaysElapsed(int d,int m,int y) { static int cd[]={0,31,59,90,120,151,181,212,243,273,304,334}; long n=365L*(y-1); if (m<3) y--; return n+y/4-y/100+y/400+cd[m-1]+d;}</pre><p>DayOfWeek macro works exactly the same as the code posted byTomohiko Sakamoto, while the day difference between date1 and date2(date1<=date2) can simply be computed this way:<p><pre>difference=DaysElapsed(d2,m2,y2)-DaysElapsed(d1,m1,y1);</pre><p>I think this is by far superior to using mktime(). The code is100 % portable (even across languages other than C), much faster,smaller and simpler than mktime(), and does not suffer from yearrange limitation.<p>Branko Radovanovic</body><!-- Mirrored from c-faq.com/lib/calendar.br.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 08:01:39 GMT --></html>⌨️ 快捷键说明
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