JS - formatting a datetime value

[dday9]

Sorry to resurrect and older post, but this seems silly to me. I wonder if formatting date/time Strings was an oversight or intentionally left out because this seems like a basic function of a scripting language.

Edit - Also, I tested this that works without having to use so many ternary if statements:

function yyyyMMdd_hhmmss(d) {
    var arrDate = d.toString().split(/ |:/);
    var yyyy = arrDate[3];
    var MM = ((d.getMonth() < 10) ? "0": "") + (d.getMonth()+1);
    var dd = arrDate[2];
    var hh = arrDate[4];
    var mm = arrDate[5];
    var ss = arrDate[6];

    return yyyy + MM + dd + '_' + hh + mm + ss;
}