Various uses of datetime in C #

Get current system time: DateTime dt = DateTime.Now; Environment.tickcount can get the "system boot to Present" millisecond value DateTime now = DateTime.Now; Console.WriteLine (now.  ToString ("Yyyy-mm-dd")); Output sconsole.writeline in YYYY-MM-DD format (dt.    ToString ()); 26/11/2009 AM 11:21:30console.writeline (dt. Tofiletime ().   ToString ()); 129036792908014024//converts the value of the current System.DateTime object to a Windows file Timeconsole.writeline (dt. TOFILETIMEUTC ().  ToString ()); 129036792908014024//converts the value of the current System.DateTime object to a Windows file Timeconsole.writeli NE (dt. ToLocalTime ().   ToString ()); 26/11/2009 AM 11:21:30//Converts the value of the current System.DateTime object to local time. Console.WriteLine (dt. Tolongdatestring ().   ToString ()); November 26, 2009 Console.WriteLine (dt. Tolongtimestring ().  ToString ()); AM 11:21:30console.writeline (dt. ToOADate ().   ToString ()); 40143.4732731597console.writeline (dt. ToShortDateString ().   ToString ()); 26/11/2009console.wrIteline (dt. Toshorttimestring ().   ToString ()); AM 11:21console.writeline (dt. ToUniversalTime ().   ToString ()); 26/11/2009 AM 3:21:30console.writeline (dt.   Year.tostring ()); 2009console.writeline (dt.   Date.tostring ()); 26/11/2009 AM 12:00:00console.writeline (dt.  Dayofweek.tostring ()); Thursdayconsole.writeline (dt.   Dayofyear.tostring ()); 330console.writeline (dt.       Hour.tostring ());   11console.writeline (Dt.Millisecond.ToString ()); 801 (ms) Console.WriteLine (dt.   Minute.tostring ()); 21console.writeline (dt.   Month.tostring ()); 11console.writeline (dt.   Second.tostring ()); 30console.writeline (dt.   Ticks.tostring ()); 633948312908014024 Console.WriteLine (dt.   Timeofday.tostring ());  12:29:51.5181524//Gets The time of day for this instance.//returns A System.TimeSpan that represents the fraction of The day is has elapsed since midnight. Console.WriteLine (dt.     ToString ());  //   26/11/2009 PM 12:29:51console.writeline (dt. AddYears (1).    ToString ()); 26/11/2010 PM 12:29:51console.writeline (dt. AddDays (1.1).    ToString ()); 27/11/2009 PM 2:53:51console.writeline (dt. AddHours (1.1).    ToString ()); 26/11/2009 PM 1:35:51console.writeline (dt. Addmilliseconds (1.1).    ToString ()); 26/11/2009 PM 12:29:51console.writeline (dt. AddMonths (1).    ToString ()); 26/12/2009 PM 12:29:51console.writeline (dt. AddSeconds (1.1).    ToString ()); 26/11/2009 PM 12:29:52console.writeline (dt. AddMinutes (1.1).    ToString ()); 26/11/2009 PM 12:30:57console.writeline (dt. Addticks (1000).    ToString ()); 26/11/2009 PM 12:29:51console.writeline (dt.compareto (DT).    ToString ()); 0console.writeline (dt. ADD (New TimeSpan (1,0,0,0)).    ToString ()); Add a time period (note: System.TimeSpan is a time period, the constructor is the following public TimeSpan (long ticks);                           Ticks:a time period expressed in 100-nanosecond units. Nanosecond: One-zero seconds new TimeSpan (10,000, 000) for one second public TimeSpan (int hours, int minutes, int. seconds);p ublic TimeSpan (int days, int hours, int minutes, int seconds);p ublic TimeSpan (int days, int hours, int minutes, int seconds, int milliseconds);) Console.WriteLine (dt. Equals ("2005-11-6 16:11:04").     ToString ()); Falseconsole.writeline (dt. Equals (DT).    ToString ()); Trueconsole.writeline (dt. GetHashCode ().    ToString ()); 1103291775console.writeline (dt. GetType ().    ToString ()); System.DateTimeConsole.WriteLine (dt. GetTypeCode ().    ToString ());   DateTime long Start = Environment.tickcount; The unit is a millisecond long End = Environment.tickcount; Console.WriteLine ("Start is:" +start); Console.WriteLine ("End is:" +end); Console.WriteLine ("The time is {0}", End-start); Console.WriteLine (dt. Getdatetimeformats (' s ') [0].    ToString ()); 2009-11-26t13:29:06console.writeline (dt. Getdatetimeformats (' t ') [0].    ToString ()); PM 1:29console.writeline (dt. Getdatetimeformats (' y ') [0].    ToString ()); November 2009 COnsole. WriteLine (dt. Getdatetimeformats (' D ') [0].    ToString ()); November 26, 2009 Console.WriteLine (dt. Getdatetimeformats (' D ') [1].    ToString ()); Thursday, 261 months, 2009console.writeline (dt. Getdatetimeformats (' D ') [2].    ToString ()); 261 months, 2009console.writeline (dt. Getdatetimeformats (' D ') [3].    ToString ()); Week 42,009 26console.writeline (dt. Getdatetimeformats (' M ') [0].    ToString ()); 261 months Console.WriteLine (dt. Getdatetimeformats (' f ') [0].    ToString ()); November 26, 2009 PM 1:29console.writeline (dt. Getdatetimeformats (' g ') [0].    ToString ()); 26/11/2009 PM 1:29console.writeline (dt. Getdatetimeformats (' R ') [0].    ToString ()); Thu, 13:29:06 GMT (note: Commonly used DateTime format: Format description output format D thin date format mm/dd/yyyy d verbose date format dddd, MMMM DD, yyyy f full Format (l Ong date + short time) dddd, MMMM dd, yyyy hh:mm F full datetime format (long date + long time) dddd, MMMM dd, yyyy HH:mm:ss G General format (s Hort Date + short time) mm/dd/yyyy hh:mm G General format (short date + long time) mm/dd/yyyy HH:mm:ss m,m Month Day format MMMM DD s moderate datetime format y YYY-MM-DD HH: MM:SS t Compact time format hh:mm t verbose time format HH:mm:ss) Console.WriteLine (String.    Format ("{0:d}", DT)); 28/12/2009console.writeline (String.    Format ("{0:d}", DT)); December 28, 2009 Console.WriteLine (String.    Format ("{0:f}", DT)); December 28, 2009 AM 10:29console.writeline (String.    Format ("{0:f}", DT)); December 28, 2009 AM 10:29:18console.writeline (String.    Format ("{0:g}", DT)); 28/12/2009 AM 10:29console.writeline (string.    Format ("{0:g}", DT)); 28/12/2009 AM 10:29:18console.writeline (string.    Format ("{0:m}", DT)); 282 months Console.WriteLine (string.    Format ("{0:r}", DT)); Mon, Dec 10:29:18 gmtconsole.writeline (string.    Format ("{0:s}", DT)); 2009-12-28t10:29:18console.writeline (String.    Format ("{0:t}", DT)); AM 10:29console.writeline (String.    Format ("{0:t}", DT)); AM 10:29:18console.writeline (String.    Format ("{0:u}", DT)); 2009-12-28 10:29:18zconsole.writeline (String.    Format ("{0:u}", DT)); December 28, 2009 AM 2:29:18console.writeline (String.    Format ("{0:y}", DT)); December 2009 ConSole. WriteLine (String.    Format ("{0}", DT)); 28/12/2009 AM 10:29:18console.writeline (string.    Format ("{0:yyyymmddhhmmssffff}", DT));    200912281029182047 calculates the difference in the number of days between 2 dates datetime DT1 = convert.todatetime ("2007-8-1");   DateTime DT2 = Convert.todatetime ("2007-8-15"); TimeSpan span = dt2.              Subtract (DT1); int Daydiff = span.                     Days;       Calculates the number of days of the month of the year int day = Datetime.daysinmonth (2009, 8);                                       days = 31; Add one day to date, reduce one day to datetime DT =DATETIME.NOW;DT. AddDays (1); Adding a day DT itself does not change dt. AddDays (-1);//reduce the day DT itself does not change

　　

Various uses of datetime in C #