If you're working on a lot of custom integrations, you are bound to eventually see dates and datetimes that are represented like this: "\/Date(1198908717056)\/". These dates show up in JSON as strings, and their numeric value represent milliseconds since January 1st 1970 UTC. I believe that this is a Microsoft standard mostly used by .net to represent epoch time.
Here's a quick and useful method that parses these ".net type" datetimes
into salesforce datetimes. Simply parse out the numeric value using the
parenthesis as guides, cast as long, and use the very useful datetime
method newInstance() to calculate the actual date.