Date.parse() doesn't work in IE 8

Question

Simple function Date.parse() not working well in Internet Explorer 8.
I am using Date.parse() to validate date in format

Answer 1

I used my method for date validation

   var isValidDate = function(dateAsString)
   {
      var parsedDate = Date.parse(dateAsString);
      if (_.isNaN(parsedDate) || !_.isEqual(new Date(parsedDate).format("mm/dd/yyyy"), dateAsString))
      {
         return false
      }

      return true
   }