IE8: Object Doesn't Support This Property or Method (Date function)

Question

I'm getting an error that only appears on the great IE8, it points to the following function, specifically the line: return (expDate.getTime() > Date.now());

$.validator.addMethod("checkDocExpiry",function(value) {
    var driverLicExp = ($('#drivers-license-expiration').val()) ? $('#drivers-license-expiration').val() : '';
    if (driverLicExp != ''){
        var expDate = new Date(driverLicExp);
        return (expDate.getTime() > Date.now());
    }else{
        return (true);
    }
}, "Your driver's license has expired.");

I'm not sure what would cause this, I am fairly new to developing for older browsers. This runs fine in FF, IE10, Chrome, Safari.

Any help would be much appreciated.

Thanks

Answer 1

Looks like Date.now() isn't supported in IE8 (see the table at the bottom):

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now

new Date() should get you a date object with the current date.

Answer 2

Shim using the fact valueOf a Date is ms..

if (!Date.now) Date.now = function () {return +new Date();};