常見日期方法薈萃 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
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.然後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中怎麼樣計算兩個日期相差的年、月份、日期、小時、分鐘 、妙等在asp.net中怎麼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中怎麼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"));//四捨五入
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(即不包括週六日)
//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(不包括週六日) 獲得任意兩日期之間的有效工作日(不包括週六日)#region 獲得任意兩日期之間的有效工作日(不包括週六日)
//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.獲得本周的週六和周日
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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