Convert json date to MM/dd/yyyy

Javascript function to convert a json date into more readable format to user.

// Converts a date received in JSON data from the server in format "\Date(1234567890123)\" to a short
// date string in format MM/dd/yyyy.
function ConvertJsonDateString(jsonDate) {
    var shortDate = null;

    if (jsonDate) {
        var regex = /-?\d+/;
        var matches = regex.exec(jsonDate);
        var dt = new Date(parseInt(matches[0]));
        var month = dt.getMonth() + 1;
        var monthString = month > 9 ? month : '0' + month;
        var day = dt.getDate();
        var dayString = day > 9 ? day : '0' + day;
        var year = dt.getFullYear();
        shortDate = monthString + '/' + dayString + '/' + year;
    }

    return shortDate;
};