Csharp(#)时间函数扩展.docVIP

C sharp(#)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 2008-07-0815:30privateintDatePart(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.-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.AddDays (daydiff).DayOfYear;/上周末是本年第几天int weeks = 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private string WeekRange(System.DateTime dt)int weeknow = Convert.ToInt32(dt.DayOfWeek);int daydiff = (-1) * weeknow;int dayadd = 6- weeknow;string dateBegin = System.DateTime.Now.AddDays(daydiff).Date.ToString (MM月dd日);string dateEnd = System.DateTime.Now.AddDays (dayadd).Date.ToString(MM月dd日);return dateBegin + - +dateEnd;/计算第几周（重新修改后）public int GetWeekOfCurrDate(DateTime dt)int Week = 1;int nYear = dt.Year;System.DateTime FirstDayInYear = new DateTime(nYear, 1, 1);System.DateTime LastDayInYear = new DateTime(nYear, 12, 31);int DaysOfYear = Convert.ToInt32(LastDayInYear.DayOfYear);int WeekNow = Convert.ToInt32(FirstDayInYear.DayOfWeek) - 1;if (WeekNow 0) WeekNow = 6;int DayAdd = 6 - WeekNow;System.DateTime BeginDayOfWeek = new DateTime(nYear, 1, 1);System.DateTime EndDayOfWeek = BeginDayOfWeek.AddDays(DayAdd);Week = 2;for (int i = DayAdd + 1; i DaysOfYear)EndDayOfWeek = BeginDayOfWeek.AddDays(DaysOfYear - i - 1);elseEndDayOfWeek = BeginDayOfWeek.AddDays(6);if (dt.Month = E