Sometimes we face problem while working on date time timezones with wcf service calls.
For example, in my situation I have code that passes date into WCF via JSON object. What was happening in my case was, when I was sending my date as “12/02/2013″(dd/mm/YYYY format) from jquery client side, it was getting the date as “11/02/2013” on the service method.

This was happening because of the time zone difference between my server and client browser.

The solution to this problem is to convert the Datetime object being passed to the server into UTC ( Datetime.ToUniversalTime) before passing it.
That way we always receive the UTC time at the server, irrespective of wherever the clients exists.

And on the client side, whenever you receive the Datetime, convert it to the localtime ( DateTime.ToLocalTime ).

Example:-

I have a input type date where I am setting date via a date picker.Suppose I have set value of the input box as ’12/10/2013′.
We need to add the following code in our jquery method where we are creating the JSON object.

var date = '12/10/2013';
 
//  Making date object from date string parameter
       var newDate = new Date();
       var splitStringDate = date.split("/");
 
       // Setting new date
       newDate.setMonth((splitStringDate[1] - 1), splitStringDate[0]);
       newDate.setDate(splitStringDate[0]);
       newDate.setYear(splitStringDate[2]);
 
// Here we will set date object to Utc
var utcDate = new Date(Date.UTC(newDate.getFullYear(), newDate.getMonth(), newDate.getDate(), newDate.getHours(), newDate.getMinutes(),         newDate.getSeconds(), newDate.getMilliseconds()));
 
// In wcf service always we have to pass the date as follows
 
var finalDate = '/Date(' + utcDate.getTime() + ')/';

Now , we can send this date object(finalDate) to service method so that it will always get the UTC time.

Hope it helps!
This tip can be downloaded from GitHub. https://github.com/bishwaranjans/DateTimeIssueInWcfCall/