Custom Date in Javascript - Looks at today's date and pulls a date range from 2 months ago.

date.js

   //gets Today's date
    var currentDate = new Date();

    //Pulls the date and month parts of the date out.
    var year = currentDate.getFullYear();
    var month = getTwoMonthsAgo(currentDate);
    
    //for formatting.
    month = padTwo(month);

    //All months start at one.
    var firstDay = "01";
    var yearMonth = year + "" + month;

    //string of YYYYMMDD
    var startDate = yearMonth + "01";

    //Finds the number of days in the target month
    var totalDays = new Date(year, month, 0).getDate();

    //string of YYYYMMDD
    var endDate = yearMonth + totalDays;

    returnString = 'CUSTOM_DATE ' + startDate + ', ' + endDate;
    return returnString

    /*
     * @param date object of today's date.
     * @return String of Month number of 2 months ago
     */
    function getTwoMonthsAgo(date){
        var month = date.getMonth();
        if(month == 1)
            month = 12;
        else if(month == 0)
            month = 11;
        else
            month -= 1;

       return month;
    }
 
    function padTwo(num){
        return (num < 10 ? '0' : '') + num;
    }