Returns true if str is a date.
isDate(str, [format], [returnDateObj])

str | string, string to format
format | string, optional, format to check
returnDateObj | boolean, optional, if true then returns JS Date object

You can specify date format. The format can contain following elements: mm, dd, yyyy, mon in any order with any formatting characters. For example 'mm.dd.yyyy', 'dd-mm-yyyy', 'mon dd, yyyy'. If format is not specified, then the format will be taken from w2utils.settings.dateFormat.
If the third argument format is true, then the method will return JavaScritp Date object is the date is valid var a = w2utils.isDate('1/1/2013'); // return true or false var a = w2utils.isDate('1/1/2013', null, true); // return JS date object