Compare two dates Google apps script

Question

What would be the best way to compare two dates?

var int = e.parameter.intlistbox;
var startDate = rSheet.getRange(parseInt(int) + 1 ,1).ge         


        

Answer 1

Somebody posted this a while back, I find it's very helpful

function testDate() {
    var futureDate = new Date('8/31/2020');
    var todayDate = new Date();
    Logger.log(DateDiff.inMonths(todayDate, futureDate));
    Logger.log(DateDiff.inYears(todayDate, futureDate));             
}

var DateDiff = {    
    inDays: function(d1, d2) {
        var t2 = d2.getTime();
        var t1 = d1.getTime();

        return parseInt((t2-t1)/(24*3600*1000));
    },
    inWeeks: function(d1, d2) {
        var t2 = d2.getTime();
        var t1 = d1.getTime();

        return parseInt((t2-t1)/(24*3600*1000*7));
    },
    inMonths: function(d1, d2) {
        var d1Y = d1.getFullYear();
        var d2Y = d2.getFullYear();
        var d1M = d1.getMonth();
        var d2M = d2.getMonth();

        return (d2M+12*d2Y)-(d1M+12*d1Y);
    },
    inYears: function(d1, d2) {
        return d2.getFullYear()-d1.getFullYear();
    }
}