Check time difference in Javascript

Question

How would you check time difference from two text-boxes in Javascript?

Answer 1

I like doing it via Epoch.

var now = new Date();
var future = new Date(now.setMinutes(15));

var futureEpoch = moment(future).unix();
var nowEpoch = moment(now).unix();
var differenceInEpoch = nowEpoch - scheduledEpoch ;

console.log("futureEpoch        : " + futureEpoch);
console.log("nowEpoch              : " + nowEpoch);
console.log("differenceInEpoch     : " + differenceInEpoch);

var diffTime = new Date(0); // The 0 there is the key, which sets the date to the epoch
diffTime.setUTCSeconds(differenceInEpoch);
console.log("new diffTime : " + diffTime);