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 s by YYYY-MM-DD format
Console.WriteLine (dt. ToString ()); 26/11/2009 AM 11:21:30
Console.WriteLine (dt. Tofiletime (). ToString ()); 129036792908014024
Converts the value of the System.DateTime object to a Windows file time
Console.WriteLine (dt. TOFILETIMEUTC (). ToString ()); 129036792908014024
Converts the value of the System.DateTime object to a Windows file time
Console.WriteLine (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 11:21:30
Console.WriteLine (dt. ToOADate (). ToString ()); 40143.4732731597
Console.WriteLine (dt. ToShortDateString (). ToString ()); 26/11/2009
Console.WriteLine (dt. Toshorttimestring (). ToString ()); AM 11:21
Console.WriteLine (dt. ToUniversalTime (). ToString ()); 26/11/2009 AM 3:21:30
Console.WriteLine (dt. Year.tostring ()); 2009
Console.WriteLine (dt. Date.tostring ()); 26/11/2009 AM 12:00:00
Console.WriteLine (dt. Dayofweek.tostring ()); Thursday
Console.WriteLine (dt. Dayofyear.tostring ()); 330
Console.WriteLine (dt. Hour.tostring ()); 11
Console.WriteLine (Dt.Millisecond.ToString ()); 801 (MS)
Console.WriteLine (dt. Minute.tostring ()); 21st
Console.WriteLine (dt. Month.tostring ()); 11
Console.WriteLine (dt. Second.tostring ()); 30
Console.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, the has elapsed since midnight.
Console.WriteLine (dt. ToString ()); 26/11/2009 PM 12:29:51
Console.WriteLine (dt. AddYears (1). ToString ()); 26/11/2010 PM 12:29:51
Console.WriteLine (dt. AddDays (1.1). ToString ()); 27/11/2009 PM 2:53:51
Console.WriteLine (dt. AddHours (1.1). ToString ()); 26/11/2009 PM 1:35:51
Console.WriteLine (dt. Addmilliseconds (1.1). ToString ()); 26/11/2009 PM 12:29:51
Console.WriteLine (dt. AddMonths (1). ToString ()); 26/12/2009 PM 12:29:51
Console.WriteLine (dt. AddSeconds (1.1). ToString ()); 26/11/2009 PM 12:29:52
Console.WriteLine (dt. AddMinutes (1.1). ToString ()); 26/11/2009 PM 12:30:57
Console.WriteLine (dt. Addticks (1000). ToString ()); 26/11/2009 PM 12:29:51
Console.WriteLine (Dt.compareto (DT). ToString ()); 0
Console.WriteLine (dt. ADD (New TimeSpan (1,0,0,0)). ToString ()); Add a time period
Note
System.TimeSpan is a time period, the constructor is as follows
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);
public TimeSpan (int days, int hours, int minutes, int seconds);
public TimeSpan (int days, int hours, int minutes, int seconds, int milliseconds);
）
Console.WriteLine (dt. Equals ("2005-11-6 16:11:04"). ToString ()); False
Console.WriteLine (dt. Equals (DT). ToString ()); True
Console.WriteLine (dt. GetHashCode (). ToString ()); 1103291775
Console.WriteLine (dt. GetType (). ToString ()); System.DateTime
Console.WriteLine (dt. GetTypeCode (). ToString ()); Datetime
Long Start = Environment.tickcount; Unit is milliseconds
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 ()); 2009-11-26t13:29:06
Console.WriteLine (dt. Getdatetimeformats (' t ') [0]. ToString ()); PM 1:29
Console.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, 2009
Console.WriteLine (dt. Getdatetimeformats (' D ') [2]. ToString ()); 261 months, 2009
Console.WriteLine (dt. Getdatetimeformats (' D ') [3]. ToString ()); Thursday 2009 11 26
Console.WriteLine (dt. Getdatetimeformats (' M ') [0]. ToString ()); 261 months
Console.WriteLine (dt. Getdatetimeformats (' f ') [0]. ToString ()); November 26, 2009 PM 1:29
Console.WriteLine (dt. Getdatetimeformats (' g ') [0]. ToString ()); 26/11/2009 PM 1:29
Console.WriteLine (dt. Getdatetimeformats (' R ') [0]. ToString ()); Thu, 13:29:06 GMT
Note
Common Date-time formats:
Format Description Output format
D Thin Date format mm/dd/yyyy
D Detailed date format dddd, MMMM DD, yyyy
F Full Format (long 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 (short 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 medium Date time format Yyyy-mm-dd HH:MM:SS
T Lite time Format hh:mm
T Verbose time Format HH:mm:ss
)
Console.WriteLine (String. Format ("{0:d}", DT)); 28/12/2009
Console.WriteLine (String. Format ("{0:d}", DT)); December 28, 2009
Console.WriteLine (String. Format ("{0:f}", DT)); December 28, 2009 AM 10:29
Console.WriteLine (String. Format ("{0:f}", DT)); December 28, 2009 AM 10:29:18
Console.WriteLine (String. Format ("{0:g}", DT)); 28/12/2009 AM 10:29
Console.WriteLine (String. Format ("{0:g}", DT)); 28/12/2009 AM 10:29:18
Console.WriteLine (String. Format ("{0:m}", DT)); 282 months
Console.WriteLine (String. Format ("{0:r}", DT)); Mon, Dec 10:29:18 GMT
Console.WriteLine (String. Format ("{0:s}", DT)); 2009-12-28t10:29:18
Console.WriteLine (String. Format ("{0:t}", DT)); AM 10:29
Console.WriteLine (String. Format ("{0:t}", DT)); AM 10:29:18
Console.WriteLine (String. Format ("{0:u}", DT)); 2009-12-28 10:29:18z
Console.WriteLine (String. Format ("{0:u}", DT)); December 28, 2009 AM 2:29:18
Console.WriteLine (String. Format ("{0:y}", DT)); December 2009
Console.WriteLine (String. Format ("{0}", DT)); 28/12/2009 AM 10:29:18
Console.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;
Calculate the number of days of the month in a year
int days = Datetime.daysinmonth (2009, 8);
days = 31;
Add one day to date, one day less
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 #
