How to convert Javascript datetime to C datetime

Question

I have been reading that if you want to convert from JavaScript dates to C  dates you should use getTime   and then add that result to a C  DateTime   Suppose I have this JavaScript time   Date  Tue Jul 12 2011 16 00 00 GMT-0700  Pacific Daylight Time     It renders to 1310522400000 milliseconds  var a   new DateTime 1970  01  01  AddMilliseconds 1310522400000       result 7 13 2011 2 00 00 AM   So this is wrong  I am not sure what I need to do

User · Answer

Since I m in a different timezone  my JavaScript and C  end up having 2 hours difference between the same date  even when I tried to send the date to a webservice as a date  not converted to string another object     I tried to use the getTime   in JavaScript and add the milliseconds to a C  date  starting on 1970-01-01  but I ve always ended up with two hours in advance on my C  date   To grant that I would get the same Date and Hour in both sides I ended up doing this   In JavaScript I ve used the UTC function   var jsDate   Date UTC year month day hours minutes seconds millisec     And in C  to get the correct DateTime I did this   var date   new DateTime 1970  1  1  0  0  0  0  AddMilliseconds jsDate     Hope it helps someone

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If you are using moment js in your application    var x   moment new Date    format  DD MM YYYY hh mm ss     Pass x to codebehind function and accept it as a string parameter  Use the DateTime ParseExact   in c  to convert this string to DateTime as follows   DateTime ParseExact YourString   dd MM yyyy HH mm ss   CultureInfo InvariantCulture

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JS    function createDateObj date                var day   date getDate                 yields              var month   date getMonth          yields month             var year   date getFullYear            yields year             var hour   date getHours               yields hours              var minute   date getMinutes           yields minutes             var second   date getSeconds           yields seconds             var millisec   date getMilliseconds                var jsDate   Date UTC year  month  day  hour  minute  second  millisec               return jsDate              JS   var oRequirementEval   new Object    var date   new Date     dueDate   val       CS   requirementEvaluations DeadLine   new DateTime 1970  1  1  0  0  0  DateTimeKind Utc       AddMilliseconds Convert ToDouble  arrayUpdateRequirementEvaluationData  DeadLine          ToLocalTime

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You could use the toJSON   JavaScript method  it converts a JavaScript DateTime to what C  can recognise as a DateTime    The JavaScript code looks like this  var date   new Date    date toJSON       this is the JavaScript date as a c  DateTime   Note  The result will be in UTC time

User · Answer

There were some mistakes in harun s answer which are corrected below   1  date where harun used getDay   which is incorrect should be getDate    2  getMonth   gives one less month than actual month  So we should increment it by 1 as shown below  var date   new Date    var day   date getDate                 yields  var month   date getMonth     1        yields month var year   date getFullYear            yields year var hour   date getHours               yields hours  var minute   date getMinutes           yields minutes var second   date getSeconds           yields seconds     After this construct a string with the above results as below var time   day         month         year         hour         minute         second     Pass this string to codebehind function and accept it as a string parameter Use the DateTime ParseExact   in codebehind to convert this string to DateTime as follows   DateTime ParseExact YourString   dd MM yyyy HH mm ss   CultureInfo InvariantCulture     This Worked for me  Hope this help you too

User · Answer

First create a string in your required format using the following functions in JavaScript  var date   new Date    var day   date getDate             yields date var month   date getMonth     1        yields month  add one as   getMonth    is zero indexed  var year   date getFullYear        yields year var hour   date getHours           yields hours  var minute   date getMinutes       yields minutes var second   date getSeconds       yields seconds     After this construct a string with the above results as below var time   day         month         year         hour         minute         second     Pass this string to codebehind function and accept it as a string parameter Use the DateTime ParseExact   in codebehind to convert this string to DateTime as follows   DateTime ParseExact YourString   dd MM yyyy HH mm ss   CultureInfo InvariantCulture     Hope this helps

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JavaScript  HTML5   function TimeHelper GetDateAndFormat         var date   new Date         return MakeValid date getDate    concat          HtmlConstants FRONT SLASH          MakeValid date getMonth     1           HtmlConstants FRONT SLASH          MakeValid date getFullYear             HtmlConstants SPACE          MakeValid date getHours             HtmlConstants COLON          MakeValid date getMinutes             HtmlConstants COLON          MakeValid date getSeconds         function MakeValid timeRegion        return timeRegion     undefined  amp  amp  timeRegion  lt  10     0    timeRegion  toString     timeRegion toString        C   private const string DATE FORMAT    dd MM yyyy HH mm ss    public DateTime  JavaScriptDateParse string dateString        DateTime date      return DateTime TryParseExact dateString  DATE FORMAT  CultureInfo InvariantCulture  DateTimeStyles None  out date    date   null

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You were almost right  there s just need one little fix to be made   var a   new DateTime 1970  1  1  0  0  0  DateTimeKind Utc       AddMilliseconds 1310522400000       ToLocalTime

User · Answer

If you are in the U S  Pacific time zone  then the epoch for you is 4 p m  on December 31  1969   You added the milliseconds since the epoch to   new DateTime 1970  01  01    which  since it did not have a timezone  was interpreted as being in your timezone   There is nothing really wrong with thinking of instants in time as milliseconds since the epoch but understand the epoch is only 1970-01-01T00 00 00Z   You can t think of instants in times  when represented as dates  without timezones

User · Answer

You can also send Js time to C  with Moment js Library    JavaScript   var dateString   moment new Date    format  LLLL    C    DateTime Parse dateString

User · Answer

If you want to send dates to C  from JS that is actually quite simple - if sending UTC dates is acceptable   var date   new Date  Tue Jul 12 2011 16 00 00 GMT-0700    var dateStrToSendToServer   date toISOString          send to C  side      var success   DateTimeOffset TryParse jsISOStr  CultureInfo InvariantCulture  DateTimeStyles AssumeUniversal  out var result     C  DateTime already understands ISO date formats and will parse it just fine   To format from C  to JS just use DateTime UtcNow ToString  o     Personally  I m never comfortable relying on math and logic between different environments to get the milliseconds ticks to show the EXACT same date and time a user may see on the client  especially where it matters   I would do the same when transferring currency as well  use strings instead to be safe  or separate dollars and cents between two different integers   Sending the date time as separate values would be just a good  see accepted answer

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Newtonsoft Json JsonConvert SerializeObject Convert ToDateTime dr col ColumnName    Replace           Trim

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UPDATE  From  NET Version 4 6 use the FromUnixTimeMilliseconds method of the DateTimeOffset structure instead       DateTimeOffset FromUnixTimeMilliseconds 1310522400000  DateTime

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I think you can use the  TimeZoneInfo    to convert the datetime          static void Main string   args                long time   1310522400000          DateTime dt 1970   new DateTime 1970  1  1           long tricks 1970   dt 1970 Ticks          long time tricks   tricks 1970   time   10000          DateTime dt   new DateTime time tricks            Console WriteLine dt ToShortDateString        result   7 13         dt   TimeZoneInfo ConvertTimeToUtc dt            Console WriteLine dt ToShortDateString         result   7 12         Console Read

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DateTime Parse is a much better bet  JS dates and C  dates do not start from the same root   Sample   DateTime dt   DateTime ParseExact  Tue Jul 12 2011 16 00 00 GMT-0700                                      ddd MMM d yyyy HH mm ss tt zzz                                     CultureInfo InvariantCulture

[c#] How to convert Javascript datetime to C# datetime?

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