Converting .NET DateTime to JSON

05/23/2020 20:00:01

Possible Duplicate:
How to format a JSON date?

My webs service is returning a DateTime to a jQuery call. The service returns the data in this format:


How can I convert this into a JavaScript-friendly date?

Verified Answer (246 Votes)

06/19/2009 14:29:02

What is returned is milliseconds since epoch. You could do:

var d = new Date();

On how to format the date exactly as you want, see full Date reference at

You could strip the non-digits by either parsing the integer (as suggested here):

var date = new Date(parseInt(jsonDate.substr(6)));

Or applying the following regular expression (from Tominator in the comments):

var jsonDate = jqueryCall();  // returns "/Date(1245398693390)/"; 
var re = /-?\d+/; 
var m = re.exec(jsonDate); 
var d = new Date(parseInt(m[0]));

Answer #2 (78 Votes)

06/19/2009 14:21:01

I have been using this method for a while:

using System;

public static class ExtensionMethods {
  // returns the number of milliseconds since Jan 1, 1970 (useful for converting C# dates to JS dates)
  public static double UnixTicks(this DateTime dt)
    DateTime d1 = new DateTime(1970, 1, 1);
    DateTime d2 = dt.ToUniversalTime();
    TimeSpan ts = new TimeSpan(d2.Ticks - d1.Ticks);
    return ts.TotalMilliseconds;

Assuming you are developing against .NET 3.5, it's a straight copy/paste. You can otherwise port it.

You can encapsulate this in a JSON object, or simply write it to the response stream.

On the Javascript/JSON side, you convert this to a date by simply passing the ticks into a new Date object:

  success: function(msg) {
    var d = new Date(msg);

Answer #3 (33 Votes)

09/07/2010 06:57:04

To parse the date string using String.replace with backreference:

var milli = "/Date(1245398693390)/".replace(/\/Date\((-?\d+)\)\//, '$1');
var d = new Date(parseInt(milli));
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