一.如何獲得當月有多少天
int?m=System.DateTime.DaysInMonth(System.DateTime.Now.Year,System.DateTime.Now.Month); 二.日期型格式處理通用方法
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.在業務邏輯層中
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調用就可以了，如果需要修改格式只需要修改webconfig中的，且可以保證整個系統中的所有格式都是一致的
三.在asp.net中怎么樣計算兩個日期相差的年、月份、日期、小時、分鐘 、妙等
在asp.net中怎么樣計算兩個日期相差的年、月份、日期、小時、分鐘?、妙等#region?在asp.net中怎么樣計算兩個日期相差的年、月份、日期、小時、分鐘?、妙等
//????????調用
//????????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.獲取某月的實際工作日(即不包括周六日)
//調用
//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.獲得任意兩日期之間的有效工作日(不包括周六日) 獲得任意兩日期之間的有效工作日(不包括周六日)#region?獲得任意兩日期之間的有效工作日(不包括周六日)
????????//調用
????????//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.格式輸出
格式輸出#region?格式輸出
????????private?void?Page_Load(object?sender,?System.EventArgs?e)
????????{
????????????System.Globalization.DateTimeFormatInfo?myDTFI?=?new?System.Globalization.CultureInfo(?"en-US",?false?).DateTimeFormat;//中國用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)
????????????*/


????????}????????
????????#endregion 七.獲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????

//調用
DateTime?firstdate=System.DateTime.Now;????
DateTime?lastdate=System.DateTime.Now;
ConvertDateToWeek(date,out?firstdate,out?lastdate); 八獲得當前日期是該年度的第幾周
DateTime?dt?=?Convert.ToDateTime("2006-05-01");
int?weeks?=?dt.DayOfYear?/?7?+?1;

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