How do I format a Microsoft JSON date?

eval() is not necessary. This will work fine:

var date = new Date(parseInt(jsonDate.substr(6)));

The substr() function takes out the /Date( part, and the parseInt() function gets the integer and ignores the )/ at the end. The resulting number is passed into the Date constructor.


I have intentionally left out the radix (the 2nd argument to parseInt); see my comment below.

Also, I completely agree with Rory’s comment: ISO-8601 dates are preferred over this old format – so this format generally shouldn’t be used for new development.

For ISO-8601 formatted JSON dates, just pass the string into the Date constructor:

var date = new Date(jsonDate); //no ugly parsing needed; full timezone support

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