How to change time in DateTime

Question

How can I change only the time in my DateTime variable  s    DateTime s   some datetime

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int year   2012  int month   12  int day   24  int hour   0  int min   0  int second   23  DateTime dt   new DateTime year  month  day  hour  min  second

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DateTime is an immutable type  so you can t change it   However  you can create a new DateTime instance based on your previous instance  In your case  it sounds like you need the Date property  and you can then add a TimeSpan that represents the time of day   Something like this   var newDt   s Date   TimeSpan FromHours 2

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The fastest way to copy time              DateTime justDate   new DateTime 2011  1  1      1 1 2011 12 00 00AM the date you will be adding time to  time ticks   0 DateTime timeSource   new DateTime 1999  2  4  10  15  30      2 4 1999 10 15 30AM - time tick   x  justDate   new DateTime justDate Date Ticks   timeSource TimeOfDay Ticks    Console WriteLine justDate      1 1 2011 10 15 30AM Console Read

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Doesn t that fix your problems    Dateime dt   DateTime Now  dt   dt AddSeconds 10

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DateTime ts   DateTime Now  ts   new DateTime   ts Year  ts Month  ts Day  0  0  0     Console WriteLine    Today       ts ToString  M dd yy HH mm ss         Executed      Today   9 04 15 00 00 00

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Since DateTime is immutable  a new instance has to be created when a date component needs to be changed  Unfortunately  there is no built-in functionality to set individual components of a DateTime instance   Using the following extension methods  public static DateTime SetPart this DateTime dateTime  int  year  int  month  int  day  int  hour  int  minute  int  second        return new DateTime          year    dateTime Year          month    dateTime Month          day    dateTime Day          hour    dateTime Hour          minute    dateTime Minute          second    dateTime Second           public static DateTime SetYear this DateTime dateTime  int year        return dateTime SetPart year  null  null  null  null  null      public static DateTime SetMonth this DateTime dateTime  int month        return dateTime SetPart null  month  null  null  null  null      public static DateTime SetDay this DateTime dateTime  int day        return dateTime SetPart null  null  day  null  null  null      public static DateTime SetHour this DateTime dateTime  int hour        return dateTime SetPart null  null  null  hour  null  null      public static DateTime SetMinute this DateTime dateTime  int minute        return dateTime SetPart null  null  null  null  minute  null      public static DateTime SetSecond this DateTime dateTime  int second        return dateTime SetPart null  null  null  null  null  second       you can set individual DateTime components like  var now   DateTime Now   now SetSecond 0

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I prefer this   DateTime s     get some datetime  s   new DateTime s Year  s Month s Day s Hour s Minute 0

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Simplest solution    DateTime s     some Datetime that you want to change time for 8 36 44   s   new DateTime s Year  s Month  s Day  8  36  44     And if you need a specific Date and Time Format    s   new DateTime s Year  s Month  s Day  8  36  44  ToString  yyyy-MM-dd h mm ss

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Try this one  var NewDate   Convert ToDateTime DateTime Now ToString  dd MMM yyyy        10 15 PM    Add your time here

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one liner  var date   DateTime Now Date Add new TimeSpan 4  30  0      would bring back todays date with a time of 4 30 00  replace DateTime Now with any date object

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In fact  you can t change the time once it s created  But you can create it easily with many constructors  https   docs microsoft com en-us dotnet api system datetime -ctor view netframework-4 7 2  For example  if you want to create a DateTime changing Seconds  you can just do this   DateTime now   DateTime Now  DateTime secondschanged   new DateTime now Year  now Month  now Day  now Hour  now Minute  yourseconds

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Use Date Add and add a New TimeSpan with the new time you want to add  DateTime dt   DateTime Now dt Date Add new TimeSpan 12 15 00

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here is a ghetto way  but it works     DateTime dt   DateTime Now    get a DateTime variable for the example string newSecondsValue    00   dt   Convert ToDateTime dt ToString  MM dd yyyy hh mm     newSecondsValue

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s   s Date AddHours x  AddMinutes y  AddSeconds z     In this way you preserve your date  while inserting a new hours  minutes and seconds part to your liking

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Adding  Date to your date sets it to midnight  00 00    MyDate Date   Note The equivavalent SQL is CONVERT DATETIME  CONVERT DATE   MyDate    What makes this method so good is that it s both quick to type and easy to read  A bonus is that there is no conversion from strings   I e  To set today s date to 23 30  use   DateTime Now Date AddHours 23  AddMinutes 30    You can of course replace DateTime Now or MyDate with any date of your choice

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Here is a method you could use to do it for you  use it like this  DateTime newDataTime   ChangeDateTimePart oldDateTime  DateTimePart Seconds  0     Here is the method  there is probably a better way  but I just whipped this up   public enum DateTimePart   Years  Months  Days  Hours  Minutes  Seconds    public DateTime ChangeDateTimePart DateTime dt  DateTimePart part  int newValue        return new DateTime          part    DateTimePart Years   newValue   dt Year          part    DateTimePart Months   newValue   dt Month          part    DateTimePart Days   newValue   dt Day          part    DateTimePart Hours   newValue   dt Hour          part    DateTimePart Minutes   newValue   dt Minute          part    DateTimePart Seconds   newValue   dt Second

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If you already have the time stored in another DateTime object you can use the Add method    DateTime dateToUse   DateTime Now    DateTime timeToUse   new DateTime 2012  2  4  10  15  30     10 15 30 AM  DateTime dateWithRightTime   dateToUse Date Add timeToUse TimeOfDay     The TimeOfDay property is a TimeSpan object and can be passed to the Add method  And since we use the Date property of the dateToUse variable we get just the date and add the time span

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Happened upon this post as I was looking for the same functionality this could possibly do what the guy wanted  Take the original date and replace the time part  DateTime dayOpen   DateTime Parse processDay ToShortDateString       05 00 AM

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The best solution is   currdate AddMilliseconds currdate Millisecond   -1  AddSeconds currdate Second   -1  AddMinutes currdate Minute   -1  AddHours currdate Hour   -1

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I have just come across this post because I had a similar issue whereby I wanted to set the time for an Entity Framework object in MVC that gets the date from a view  datepicker  so the time component is 00 00 00 but I need it to be the current time  Based on the answers in this post I came up with   myEntity FromDate    DateTime Now TimeOfDay

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If you have a DateTime like 2014 02 05 18 19 51 and want just 2014 02 05  you can do that    yourDateTime   new DateTime  yourDateTime Year   yourDateTime Month   yourDateTime Day

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DateTime s    s   datevalue                 s   s AddMilliseconds 10                   s   s AddMinutes 10                   s   s AddSeconds 10                   s   s AddHours 10     you could add  ve -ve values in parameter   s Add new TimeSpan 1  1  1

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You can t change a DateTime value - it s immutable  However  you can change the variable to have a new value  The easiest way of doing that to change just the time is to create a TimeSpan with the relevant time  and use the DateTime Date property   DateTime s        TimeSpan ts   new TimeSpan 10  30  0   s   s Date   ts    s will now be the same date  but at 10 30am   Note that DateTime disregards daylight saving time transitions  representing  naive  Gregorian time in both directions  see Remarks section in the DateTime docs   The only exceptions are  Now and  Today  they retrieve current system time which reflects these events as they occur   This is the kind of thing which motivated me to start the Noda Time project  which is now production-ready  Its ZonedDateTime type is made  aware  by linking it to a tz database entry

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Using an extencion to DateTime             public enum eTimeFragment                       hours              minutes              seconds              milliseconds                   public static DateTime ClearTimeFrom this DateTime dateToClear  eTimeFragment etf                        DateTime dtRet   dateToClear              switch  etf                                case eTimeFragment hours                      dtRet   dateToClear Date                      break                  case eTimeFragment minutes                      dtRet   dateToClear AddMinutes dateToClear Minute   -1                       dtRet   dtRet ClearTimeFrom eTimeFragment seconds                       break                  case eTimeFragment seconds                      dtRet   dateToClear AddSeconds dateToClear Second   -1                       dtRet   dtRet ClearTimeFrom eTimeFragment milliseconds                       break                  case eTimeFragment milliseconds                      dtRet   dateToClear AddMilliseconds dateToClear Millisecond   -1                       break                            return dtRet               Use like this   Console WriteLine  DateTime Now ClearTimeFrom eTimeFragment hours    this has to return  2016-06-06 00 00 00 000

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Alright I m diving in with my suggestion  an extension method   public static DateTime ChangeTime this DateTime dateTime  int hours  int minutes  int seconds  int milliseconds        return new DateTime          dateTime Year          dateTime Month          dateTime Day          hours          minutes          seconds          milliseconds          dateTime Kind       Then call   DateTime myDate   DateTime Now ChangeTime 10 10 10 0     It s important to note that this extension returns a new date object  so you can t do this   DateTime myDate   DateTime Now  myDate ChangeTime 10 10 10 0     But you can do this   DateTime myDate   DateTime Now  myDate   myDate ChangeTime 10 10 10 0

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When you construct your DateTime object  use a constructor that allows you to specify time   var myDateTime   new DateTime 2000  01  01  13  37  42       2000-01-01 13 37 42   If you already have a DateTime object and wish to change the time  uou can add minutes  hours or seconds to your DateTime using simple methods   var myDateTime   new DateTime 2000  01  01                   2000-01-01 00 00 00 myDateTime   myDateTime AddHours 13                          2000-01-01 13 00 00 myDateTime   myDateTime AddMinutes 37                        2000-01-01 13 37 00 myDateTime   myDateTime AddSecounds 42                       2000-01-01 13 37 42   Notice how we have to  save  the result from each method call to the myDateTime variable  This is because the DateTime is immutable  and its methods simply create new instances with the extra hours minutes seconds added   If you need to add both hours and minutes  and or seconds  and the same time  you can simplify the code by adding a TimeSpan to the original DateTime instead   var myDateTime   new DateTime 2000  01  01                   2000-01-01 00 00 00 myDateTime    new TimeSpan 13  37  42                        2000-01-01 13 37 42   If you want to set absolute hours minues seconds  rather than adding to the existing values  you can use the aforementioned DateTime constructor  and reuse values for year month day from earlier   myDateTime   new DateTime myDateTime Year  myDateTime Month  myDateTime Day                            20  33  19                         2000-01-01 20 33 19

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What s wrong with DateTime AddSeconds method where you can add or substract seconds

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You can assign an initial value to a new DateTime value in many different ways    Extension Method   Extension method DateTime      public static DateTime ChangeTime this DateTime dateTime  int hours  int minutes  int seconds   default  int milliseconds   default                return new DateTime dateTime Year  dateTime Month  dateTime Day  hours  minutes  seconds  milliseconds  dateTime Kind           then using ChangeTime       DateTime datetime   DateTime Now    Your DateTime     datetime   datetime ChangeTime 12  20  10      using the Add methods  DateTime datetime   DateTime Now    Your DateTime datetime   datetime Date AddHours 12  AddMinutes 20  AddSeconds 10    using the Timespan  DateTime datetime   DateTime Now    Your DateTime datetime   datetime Date Add new TimeSpan 12  20  10     using initial value  DateTime datetime   DateTime Now  datetime   new DateTime datetime Year  datetime Month  datetime Day  12  20  10

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