Author:小山
from:Cnblogs
常见日期方法荟萃 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 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;}#endregion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;}#endregion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-cnDateTime myDT =System.DateTime.Now;Response.Write(myDT.ToString("f",myDTFI));/**//**//**//*This code produces the following output.FORMAT en-US EXAMPLECHAR VALUE OF ASSOCIATED PROPERTY, IF ANYd 1/3/2002M/d/yyyy (ShortDatePattern)D Thursday, January 03, 2002dddd, MMMM dd, yyyy (LongDatePattern)f Thursday, January 03, 2002 12:00 AMF Thursday, January 03, 2002 12:00:00 AMdddd, MMMM dd, yyyy h:mm:ss tt (FullDateTimePattern)g 1/3/2002 12:00 AMG 1/3/2002 12:00:00 AMm January 03MMMM dd (MonthDayPattern)M January 03MMMM dd (MonthDayPattern)r Thu, 03 Jan 2002 00:00:00 GMTddd, dd MMM yyyy HH':'mm':'ss 'GMT' (RFC1123Pattern)R Thu, 03 Jan 2002 00:00:00 GMTddd, dd MMM yyyy HH':'mm':'ss 'GMT' (RFC1123Pattern)s 2002-01-03T00:00:00yyyy'-'MM'-'dd'T'HH':'mm':'ss (SortableDateTimePattern)t 12:00 AMh:mm tt (ShortTimePattern)T 12:00:00 AMh:mm:ss tt (LongTimePattern)u 2002-01-03 00:00:00Zyyyy'-'MM'-'dd HH':'mm':'ss'Z' (UniversalSortableDateTimePattern)U Thursday, January 03, 2002 8:00:00 AMy January, 2002MMMM, yyyy (YearMonthPattern)Y January, 2002MMMM, yyyy (YearMonthPattern)*/}#endregion七.获得本周的周六和周日ConvertDateToWeek#region ConvertDateToWeekpublic 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;
