具有特定时区的Javascript整数到日期时间

Question

I have the following datetime saved in an SQL Server 2005 database: 2012-12-06 16:20:11.010 .

I want to display this datetime using javascript on the client side, so I serialize it (as part of a larger object) using System.Web.Helpers.Json.Encode , which runs the following code:

internal static readonly long DatetimeMinTimeTicks = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).Ticks;

private static void SerializeDateTime(DateTime datetime, StringBuilder sb, JavaScriptSerializer.SerializationFormat serializationFormat)
{
    if (serializationFormat == JavaScriptSerializer.SerializationFormat.JSON)
    {
        sb.Append("\"\\/Date(");
        sb.Append((datetime.ToUniversalTime().Ticks - JavaScriptSerializer.DatetimeMinTimeTicks) / 10000L);
        sb.Append(")\\/\"");
        return;
    }
    sb.Append("new Date(");
    sb.Append((datetime.ToUniversalTime().Ticks - JavaScriptSerializer.DatetimeMinTimeTicks) / 10000L);
    sb.Append(")");
}

On the client side, I convert it into a datetime object like so: ( JSFiddle )

var strDate = "/Date(1354828811010)/"; //value returned by above function
var re = /-?\d+/;
var m = re.exec(strDate);            
var date = new Date(parseInt(m[0]));

On a PC with the timezone set to Eastern Standard, this time appears correctly as Thu Dec 06 2012 16:20:11 GMT-0500 (Eastern Standard Time) . However, on a pc with the timezone as GMT-6, it returns as Thu Dec 06 2012 15:20:11 GMT-0600 (Central Standard Time) .

This time is correct as Thu Dec 06 2012 16:20:11 GMT-0600 (Central Standard Time) , but I'm not sure how to best display it correctly. I don't need to actually display the timezone, I just need it to show up as 16:20:11 regardless of the user's local timezone settings.

Is there a mechanism in javascript to let me force a date to a specific timezone? The research I've done on it suggests there isn't.

Otherwise, if I need to make a change server side, what's my best bet?

Answer 1

I believe what you're looking for is related to what is described in Moment.js issue 611 . If so, would you please add your feedback to this issue? It is certainly a showstopper for me.

BTW - I looked at DateJS and XDate also, and as far as I can tell, none have this functionality. JavaScript seems locked in at either UTC or the local timezone of the browser.

Also, Moment.js already handles the Microsoft date format that JavaScriptSerializer emits, so you can use it directly. However, I would strongly recommend using JSON.Net instead. Even Microsoft is using this now. It will return dates in ISO format by default.

Answer 2

Take a look at Moments.js , it is one of a number of javascript date libraries that can help you with your date/time requirements.

others include datejs and Xdate

Answer 3

DateTime.ToUniversalTime() is going to include the timezone in the serialized value and javascript is going to read it. If you don't want that to happen don't serialize it with the timezone. Just use the DateTime.toString() method and give it a simple format string like:

datetime.toString("o");

which will output something like

2008-06-15T21:15:07.0000000