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

#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)

#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

#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)

}

#endregion

七.获得本周的周六和周日

#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;

posted on 2007-06-07 18:23 冷火阅读(323) 评论(0) 收藏举报