Generate Random GlideDateTime for ServiceNow

generateRandomDate.js

/**
 * Generate a random GlideDateTime
 * If start and end are not specified you'll get a random date within the past year
 * 
 * @param [start] GlideDateTime - optionally defines the start of the window
 * @param [end] GlideDateTime - optionally defines the end of the window
 * @return GlideDateTime
 */
function generateRandomDate(/*[GlideDateTime]*/start, /*[GlideDateTime]*/ end){
    var temp = new GlideDateTime();
    
    if (start instanceof GlideDateTime && end instanceof GlideDateTime) {
        temp.setValue(start.getValue());
    }
    else {
        temp.addYears(-1);
        end = new GlideDateTime(); //now
    }
    
    var totalDays = Math.floor(gs.dateDiff(temp, end, true) / (60 * 60 * 24));
    var rndSecs = Math.floor(Math.random() * (60 * 60 * 24)); //seconds in a day
    temp.addSeconds(rndSecs);
    
    var rndDays = Math.floor(Math.random() * totalDays) + 1;
    temp.addDays(rndDays);
    return temp;
}