My WCF webservice is returning C# DateTime objects as JSON like this,
\"/Date(1293793200000+1300)/\"
I have found this,
Converting .NET DateTime to JSON<
You can ignore the time zone offset - the number of milliseconds is always relative to UTC (see the "DateTime wire format" section at http://msdn.microsoft.com/en-us/library/bb412170.aspx). The offset mostly indicates that the original DateTime value was of DateTimeKind.Local, but the serialized milliseconds since the epoch is always relative to GMT.
You can convert the DateTime object in .NET to a string and just serialize the string. That's what I did. See Proper way to format date from database using javascript/jquery