I\'ve seen so many different standards for the JSON date format:
\"\\\"\\\\/Date(1335205592410)\\\\/\\\"\" .NET JavaScriptSerializer \"\\\"\\\\/Date(
In Sharepoint 2013, getting data in JSON there is no format to convert date into date only format, because in that date should be in ISO format
yourDate.substring(0,10)
This may be helpful for you