[转]C#根据当前时间确定日期范围（本周、本月、本季度、本年度及常见日期方法荟萃 - 岁末年初
DateTime dt = DateTime.Now; //当前时间DateTime startWeek = dt.AddDays(1 - Convert.ToInt32(dt.DayOfWeek.ToString("d"))); //本周周一DateTime endWeek = startWeek.AddDays(6); //本周周日DateTime startMonth = dt.AddDays(1 - dt.Day); //本月月初DateTime endMonth = startMonth.AddMonths(1).AddDays(-1); //本月月末//DateTime endMonth = startMonth.AddDays((dt.AddMonths(1) - dt).Days - 1); //本月月末DateTime startQuarter = dt.AddMonths(0 - (dt.Month - 1) % 3).AddDays(1 - dt.Day); //本季度初DateTime endQuarter = startQuarter.AddMonths(3).AddDays(-1); //本季度末DateTime startYear = new DateTime(dt.Year, 1, 1); //本年年初DateTime endYear = new DateTime(dt.Year, 12, 31); //本年年末昨天、明天、上周、上月、上季度、上年度等等，只要AddDays()、AddMonths()、AddYears()这几种方法组合
一.如何获得当月有多少天
int m=System.DateTime.DaysInMonth(System.DateTime.Now.Year,System.DateTime.Now.Month);二.日期型格式处理通用方法
1.在webconfig中配置如下
<add key="ShortDatePattern" value="MM-dd-yyyy" /><add key="LongDatePattern" value="dddd-MMMM dd-yyyy" /><add key="ShortTimePattern" value="hh:mm tt" /><add key="LongTimePattern" value="hh:mm tt" />2.在global.asax中protected void Application_BeginRequest(Object sender, EventArgs e){Thread currentThread = Thread.CurrentThread;CultureInfo cul = currentThread.CurrentCulture.Clone() as CultureInfo;cul.DateTimeFormat.ShortDatePattern= BLLFacade.Common.GetShortDatePattern();cul.DateTimeFormat.LongDatePattern= BLLFacade.Common.GetLongDatePattern();cul.DateTimeFormat.ShortTimePattern= BLLFacade.Common.GetShortTimePattern();cul.DateTimeFormat.LongTimePattern= BLLFacade.Common.GetLongTimePattern();currentThread.CurrentCulture = cul;}3.在业务逻辑层中
public static string GetShortDatePattern(){return System.Configuration.ConfigurationSettings.AppSettings["ShortDatePattern"];}public static string GetLongDatePattern(){return System.Configuration.ConfigurationSettings.AppSettings["LongDatePattern"];}public static string GetShortTimePattern(){return System.Configuration.ConfigurationSettings.AppSettings["ShortTimePattern"];}public static string GetLongTimePattern(){return System.Configuration.ConfigurationSettings.AppSettings["LongTimePattern"];}4.然后在其他地方正常调用就可以了，如果需要修改格式只需要修改webconfig中的，且可以保证整个系统中的所有格式都是一致的
三.在asp.net中怎么样计算两个日期相差的年、月份、日期、小时、分钟 、妙等
在asp.net中怎么样计算两个日期相差的年、月份、日期、小时、分钟 、妙等#region 在asp.net中怎么样计算两个日期相差的年、月份、日期、小时、分钟 、妙等
// 调用
// DateTime a=Convert.ToDateTime("2005-09-03 20:15");// DateTime b=Convert.ToDateTime("2005-09-04 09:09 ");// double d=Bll.Common.DateDiff(Bll.Common.EnumDateCompare.day,a,b);// Response.Write(d.ToString("f0"));//四舍五入 public enum EnumDateCompare { year =1, month =2, day =3, hour =4, minute =5, second =6 } public static double DateDiff(EnumDateCompare howtocompare, System.DateTime startDate, System.DateTime endDate) { double diff=0; System.TimeSpan TS = new System.TimeSpan(endDate.Ticks-startDate.Ticks); switch (howtocompare) { case EnumDateCompare.year: diff = Convert.ToDouble(TS.TotalDays/365); break; case EnumDateCompare.month: diff = Convert.ToDouble((TS.TotalDays/365)*12); break; case EnumDateCompare.day: diff = Convert.ToDouble(TS.TotalDays); break; case EnumDateCompare.hour: diff = Convert.ToDouble(TS.TotalHours); break; case EnumDateCompare.minute: diff = Convert.ToDouble(TS.TotalMinutes); break; case EnumDateCompare.second: diff = Convert.ToDouble(TS.TotalSeconds); break; } return diff; }四.获取某月的实际工作日(即不包括周六日)
//调用
//int days =getDays(System.DateTime.Now));private int getDays(System.DateTime date1){ int m=System.DateTime.DaysInMonth(date1.Year,date1.Month); int mm=0; for(int i=1;i<=m;i++) { System.DateTime date=Convert.ToDateTime(date1.Year+"-"+date1.Month+"-"+i); switch (date.DayOfWeek) { case System.DayOfWeek.Monday: case System.DayOfWeek.Thursday: case System.DayOfWeek.Tuesday: case System.DayOfWeek.Wednesday: case System.DayOfWeek.Friday: mm=mm+1; break; } } return mm;}五.获得任意两日期之间的有效工作日(不包括周六日) 获得任意两日期之间的有效工作日(不包括周六日)#region 获得任意两日期之间的有效工作日(不包括周六日)
//调用
//DateTime date1=Convert.ToDateTime("2005-10-20"); //DateTime date2=Convert.ToDateTime("2005-11-01"); //int days =getDays(date1,date2); private int getDays(System.DateTime date1,System.DateTime date2) { string m=DateDiff(EnumDateCompare.day,date1,date2).ToString("f0"); int mm=0; for(int i=0;i<=Convert.ToInt32(m);i++) { System.DateTime date=Convert.ToDateTime(date1.AddDays(i)); switch (date.DayOfWeek) { case System.DayOfWeek.Monday: case System.DayOfWeek.Thursday: case System.DayOfWeek.Tuesday: case System.DayOfWeek.Wednesday: case System.DayOfWeek.Friday: mm=mm+1; break; } } return mm; }六.格式输出
格式输出#region 格式输出
private void Page_Load(object sender, System.EventArgs e) { System.Globalization.DateTimeFormatInfo myDTFI = new System.Globalization.CultureInfo( "en-US", false ).DateTimeFormat;//中国用zh-cn DateTime myDT =System.DateTime.Now; Response.Write(myDT.ToString("f",myDTFI)); /**//**//**//* This code produces the following output. FORMAT en-US EXAMPLE CHAR VALUE OF ASSOCIATED PROPERTY, IF ANY d 1/3/2002 M/d/yyyy (ShortDatePattern) D Thursday, January 03, 2002 dddd, MMMM dd, yyyy (LongDatePattern) f Thursday, January 03, 2002 12:00 AM F Thursday, January 03, 2002 12:00:00 AM dddd, MMMM dd, yyyy h:mm:ss tt (FullDateTimePattern) g 1/3/2002 12:00 AM G 1/3/2002 12:00:00 AM m January 03 MMMM dd (MonthDayPattern) M January 03 MMMM dd (MonthDayPattern) r Thu, 03 Jan 2002 00:00:00 GMT ddd, dd MMM yyyy HH':'mm':'ss 'GMT' (RFC1123Pattern) R Thu, 03 Jan 2002 00:00:00 GMT ddd, dd MMM yyyy HH':'mm':'ss 'GMT' (RFC1123Pattern) s 2002-01-03T00:00:00 yyyy'-'MM'-'dd'T'HH':'mm':'ss (SortableDateTimePattern) t 12:00 AM h:mm tt (ShortTimePattern) T 12:00:00 AM h:mm:ss tt (LongTimePattern) u 2002-01-03 00:00:00Z yyyy'-'MM'-'dd HH':'mm':'ss'Z' (UniversalSortableDateTimePattern) U Thursday, January 03, 2002 8:00:00 AM y January, 2002 MMMM, yyyy (YearMonthPattern) Y January, 2002 MMMM, yyyy (YearMonthPattern) */ }七.获得本周的周六和周日
ConvertDateToWeek#region ConvertDateToWeek public static void ConvertDateToWeek(DateTime date,out DateTime firstdate,out DateTime lastdate) { DateTime first=System.DateTime.Now; DateTime last=System.DateTime.Now; switch (date.DayOfWeek) { case System.DayOfWeek.Monday: first=date.AddDays(-1); last=date.AddDays(5); break; case System.DayOfWeek.Tuesday: first=date.AddDays(-2); last=date.AddDays(4); break; case System.DayOfWeek.Wednesday: first=date.AddDays(-3); last=date.AddDays(3); break; case System.DayOfWeek.Thursday: first=date.AddDays(-4); last=date.AddDays(2); break; case System.DayOfWeek.Friday: first=date.AddDays(-5); last=date.AddDays(1); break; case System.DayOfWeek.Saturday: first=date.AddDays(-6); last=date; break; case System.DayOfWeek.Sunday: first=date; last=date.AddDays(6); break; } firstdate=first; lastdate=last; } #endregion//调用
DateTime firstdate=System.DateTime.Now;DateTime lastdate=System.DateTime.Now;ConvertDateToWeek(date,out firstdate,out lastdate);八获得当前日期是该年度的第几周DateTime dt = Convert.ToDateTime("2006-05-01");int weeks = dt.DayOfYear / 7 + 1;---------------------
作者：岁末年初
来源：CNBLOGS
原文：https://www.cnblogs.com/xptopsky/p/16385220.html
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