Just look at moment.js. Everybody who have worked with dates in javascript are going to love it.
Justin Cooney - Mar 3, 2012
Interesting, I hadn’t heard of moment.js. I’m taking a look at the site right now; it looks to have some very handy functionality for date manipulation!
The great thing with moment.js is e.g. that one can create a date object from asp.net date format like /Date(123543534)/