C # Date-time operations

Availability of current date time:

DateTime Datetime1=datetime.now;

Date-Time operations:

String str1= (datetime1. Addyears (1)). ToString (); Year added

String str1= (datetime1. Addmonths (1)). ToString ()//Plus month

String str1= (datetime1. AddDays (1)). ToString ()//Date Added

String str1= (datetime1. AddHours (1)). ToString ()/+ hour

String str1= (datetime1. AddMinutes (1)). ToString ()//bonus points

String str1= (datetime1. AddSeconds (1)). ToString ()//plus seconds

String str1= (datetime1. Addmilliseconds (1)). ToString ();/+ MS
Long Long1=system.datetime.daysinmonth (2005,2); Return to a certain period of a few days

String str1=datetime1. Dayofweek.tostring ("D"); Converts a week to 0 characters in Sunday

TimeSpan subtime=datetime1. Subtract (datetime2); The interval between datetime1 and DateTime2 is obtained, and the specific time can be separated from the subtime.

Separation of specific time:

Long long1=datetime1. year;//Year of acquisition
Long long1=datetime1. month;//Get Month
Long long1=datetime1. day;//Date of acquisition
Long long1=datetime1. hour;//get an hour
Long long1=datetime1. minute;//Get points
Long long1=datetime1. second;//Get seconds
Long long1=datetime1.millisecond;//gets milliseconds

The following is a list of specific date formatting usages in some asp.net:

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1. Format Date method of binding timing:

2. Formatting date methods for data controls such as Datagrid/datalist:
E.item.cell[0]. Text = Convert.todatetime (e.item.cell[0]. Text). ToShortDateString ();

3. Convert date display format with string class:
String.Format ("Yyyy-mm-dd", yourdatetime);

4. Convert date display format using the Convert method:
Convert.todatetime ("2005-8-23"). Tostring

("YyMMdd", System.Globalization.DateTimeFormatInfo.InvariantInfo); Support for traditional databases

5. Convert date display format directly with the ToString method:
DateTime.Now.ToString ("Yyyymmddhhmmss");
DateTime.Now.ToString ("Yyyy/mm/dd hh:mm:ss")

6. Show only years
DataBinder.Eval (Container.DataItem, "StartTime", "{0:yyyy-m}")

7. Show all parts of time, including: Date and hour

dataformatstring= "{0:yyyy-mm-dd HH24:mm:ss}" >

1.9 Chinese date display--year and month
String Stry=currenttime.tostring ("F"); Do not show seconds

1.10 Take Chinese Date show _ Years
String strym=currenttime.tostring ("Y");

1.11 Take Chinese date show _ Month Day
String strmd=currenttime.tostring ("M");

1.12 Chinese Date
String strymd=currenttime.tostring ("D");

1.13 Take the current time, the format is: 14:24
String strt=currenttime.tostring ("T");

1.14 Take the current time, the format is: 2003-09-23t14:46:48
String strt=currenttime.tostring ("s");

1.15 Take the current time, the format is: 2003-09-23 14:48:30z
String Strt=currenttime.tostring ("U");

1.16 Take the current time, format: 2003-09-23 14:48
String strt=currenttime.tostring ("G");

1.17 Take the current time, the format is: Tue, SEP 2003 14:52:40 GMT
String strt=currenttime.tostring ("R");

1.18 get the current time n days after the date time
DateTime newday = DateTime.Now.AddDays (100);

----

DateTime dt = DateTime.Now;
Label1.Text = dt. ToString ();//2005-11-5 13:21:25
Label2.Text = dt. Tofiletime (). ToString ();//127756416859912816
Label3.text = dt. TOFILETIMEUTC (). ToString ();//127756704859912816
Label4.text = dt. ToLocalTime (). ToString ();//2005-11-5 21:21:25
Label5.text = dt. Tolongdatestring (). ToString ();//November 5, 2005
Label6.text = dt. Tolongtimestring (). ToString ();//13:21:25
Label7.text = dt. ToOADate (). ToString ();//38661.5565508218
Label8.text = dt. ToShortDateString (). ToString ();//2005-11-5
Label9.text = dt. Toshorttimestring (). ToString ();//13:21
Label10.text = dt. ToUniversalTime (). ToString ();//2005-11-5 5:21:25

Label1.Text = dt. Year.tostring ();//2005
Label2.Text = dt. Date.tostring ()//2005-11-5 0:00:00
Label3.text = dt. Dayofweek.tostring ();//saturday
Label4.text = dt. Dayofyear.tostring ();//309
Label5.text = dt. Hour.tostring ();//13
Label6.text = Dt.Millisecond.ToString ();//441
Label7.text = dt. Minute.tostring ();//30
Label8.text = dt. Month.tostring ();//11
Label9.text = dt. Second.tostring ();//28
Label10.text = dt. Ticks.tostring ();//632667942284412864
Label11.text = dt. Timeofday.tostring ();//13:30:28.4412864

Label1.Text = dt. ToString ();//2005-11-5 13:47:04
Label2.Text = dt. Addyears (1). ToString ();//2006-11-5 13:47:04
Label3.text = dt. AddDays (1.1). ToString ();//2005-11-6 16:11:04
Label4.text = dt. AddHours (1.1). ToString ();//2005-11-5 14:53:04
Label5.text = dt. Addmilliseconds (1.1). ToString ();//2005-11-5 13:47:04
Label6.text = dt. Addmonths (1). ToString ();//2005-12-5 13:47:04
Label7.text = dt. AddSeconds (1.1). ToString ();//2005-11-5 13:47:05
Label8.text = dt. AddMinutes (1.1). ToString ();//2005-11-5 13:48:10
Label9.text = dt. Addticks (1000). ToString ();//2005-11-5 13:47:04
Label10.text = Dt.compareto (dt). ToString ();//0
Label11.text = dt. ADD (?). ToString ()//question mark is a time period

Label1.Text = dt. Equals ("2005-11-6 16:11:04"). ToString ();//false
Label2.Text = dt. Equals (DT). ToString ();//true
Label3.text = dt. GetHashCode (). ToString ();//1474088234
Label4.text = dt. GetType (). ToString ();//system.datetime
Label5.text = dt. GetTypeCode (). ToString ();//datetime

Label1.Text = dt. Getdatetimeformats (' s ') [0]. ToString ();//2005-11-05t14:06:25
Label2.Text = dt. Getdatetimeformats (' t ') [0]. ToString ();//14:06
Label3.text = dt. Getdatetimeformats (' y ') [0]. ToString ();//November 2005
Label4.text = dt. Getdatetimeformats (' D ') [0]. ToString ();//November 5, 2005
Label5.text = dt. Getdatetimeformats (' D ') [1]. ToString ();//2005 11 05
Label6.text = dt. Getdatetimeformats (' D ') [2]. ToString ();//Saturday 2005 11 05
Label7.text = dt. Getdatetimeformats (' D ') [3]. ToString ()//Saturday November 5, 2005
Label8.text = dt. Getdatetimeformats (' M ') [0]. ToString ();//November 5
Label9.text = dt. Getdatetimeformats (' f ') [0]. ToString ();//November 5, 2005 14:06
Label10.text = dt. Getdatetimeformats (' g ') [0]. ToString ();//2005-11-5 14:06
Label11.text = dt. Getdatetimeformats (' R ') [0]. ToString ();//sat, Nov 14:06:25 GMT

Label1.Text = string. Format ("{0:d}", DT);//2005-11-5
Label2.Text = string. Format ("{0:d}", dt);//November 5, 2005
Label3.text = string. Format ("{0:f}", dt);//November 5, 2005 14:23
Label4.text = string. Format ("{0:f}", dt);//November 5, 2005 14:23:23
Label5.text = string. Format ("{0:g}", DT);//2005-11-5 14:23
Label6.text = string. Format ("{0:g}", DT);//2005-11-5 14:23:23
Label7.text = string. Format ("{0:m}", dt);//November 5
Label8.text = string. Format ("{0:r}", DT);//sat, Nov-14:23:23 GMT
Label9.text = string. Format ("{0:s}", DT);//2005-11-05t14:23:23
Label10.text = string. Format ("{0:t}", DT);//14:23
Label11.text = string. Format ("{0:t}", DT);//14:23:23
Label12.text = string. Format ("{0:u}", DT);//2005-11-05 14:23:23z
Label13.text = string. Format ("{0:u}", dt);//November 5, 2005 6:23:23
Label14.text = string. Format ("{0:y}", dt);//November 2005
Label15.text = string. Format ("{0}", dt);//2005-11-5 14:23:23
Label16.text = string. Format ("{0:yyyymmddhhmmssffff}", DT);//2005-11-5 13:30:28.4412864

C # compares two time sizes
1, compare the time size of the experiment

String st1= "12:13";

String st2= "14:14";

DateTime Dt1=convert.todatetime (ST1);

DateTime Dt2=convert.todatetime (ST2);

DateTime Dt3=datetime.now;

if (Datetime.compare (DT1,DT2) >0)

Msg. text=st1+ ">" +ST2;

Else

Msg. Text=st1+ "<" +ST2;

Msg. text+= "/r/n" +dt1. ToString ();

if (Datetime.compare (DT1,DT3) >0)

Msg. text+= "/r/n" +st1+ ">" +DT3. ToString ();

Else

Msg. text+= "/r/n" +st1+ "<" +DT3. ToString ();

2, calculate the two time difference function, return the absolute value of the time lag:

private String DateDiff (DateTime datetime1,datetime DateTime2)

{

String Datediff=null;

Try

{

TimeSpan ts1=new TimeSpan (datetime1.ticks);

TimeSpan ts2=new TimeSpan (datetime2.ticks);

TimeSpan Ts=ts1. Subtract (TS2). Duration ();

Datediff=ts. Days.tostring () + "Days" +ts. Hours.tostring () + "Hour" +ts. Minutes.tostring () + "minutes" +ts. Seconds.tostring () + "seconds";

}

Catch

{
}

return DateDiff;

}
3, the realization calculates datetime1-36 day =datetime2 function
TimeSpan ts=new TimeSpan (40,0,0,0);

DateTime dt2=datetime.now.subtract (TS);

Msg. Text=datetime.now.tostring () + "-" +ts. Days.tostring () + "Day/r/n"; Msg. Text+=dt2. ToString ();