Csharp(#)时间函数扩展

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1、Csharp(#)时间函数扩展（计算第几周与周起止日期）2010-04-14作者：来源：互联网浏览次数：35网友评论0条2008-07-08 15:30private int DatePart(System.DateTime dt){int weeknow = Convert.ToInt32(dt.DayOfWeek);//今天星期几int daydiff = (-1) * (weeknow+1);//今日与上周末的天数差int days = System.DateTime.Now.-2008-07-0815:30privatein

2、tDatePart(System.DateTimedt){intweeknow=Convert.ToInt32(dt.DayOfWeek);//今天星期几intdaydiff=(-1)*(weeknow+1);//今日与上周末的天数差intdays=System.DateTime.Now.AddDays(daydiff).DayOfYear;//上周末是本年第几天intweeks=days/7;if(days%7!=0){weeks++;}//此时，weeks为上周是本年的第几周return(weeks+1);}//本周起止日期pr

3、ivatestringWeekRange(System.DateTimedt){intweeknow=Convert.ToInt32(dt.DayOfWeek);intdaydiff=(-1)*weeknow;intdayadd=6-weeknow;stringdateBegin=System.DateTime.Now.AddDays(daydiff).Date.ToString("MM月dd日");stringdateEnd=System.DateTime.Now.AddDays(dayadd).Date.ToString("MM

4、月dd日");returndateBegin+"-"+dateEnd;}//计算第几周（重新修改后）publicintGetWeekOfCurrDate(DateTimedt){intWeek=1;intnYear=dt.Year;System.DateTimeFirstDayInYear=newDateTime(nYear,1,1);System.DateTimeLastDayInYear=newDateTime(nYear,12,31);intDaysOfYear=Convert.ToInt32(LastDayInYear.Da

5、yOfYear);intWeekNow=Convert.ToInt32(FirstDayInYear.DayOfWeek)-1;if(WeekNow<0)WeekNow=6;intDayAdd=6-WeekNow;System.DateTimeBeginDayOfWeek=newDateTime(nYear,1,1);System.DateTimeEndDayOfWeek=BeginDayOfWeek.AddDays(DayAdd);Week=2;for(inti=DayAdd+1;i<=DaysOfYear;i++){BeginD

6、ayOfWeek=FirstDayInYear.AddDays(i);if(i+6>DaysOfYear){EndDayOfWeek=BeginDayOfWeek.AddDays(DaysOfYear-i-1);}else{EndDayOfWeek=BeginDayOfWeek.AddDays(6);}if(dt.Month==EndDayOfWeek.Month&&dt.Day<=EndDayOfWeek.Day){break;}Week++;i=i+6;}returnWeek;}