Generate random date between two dates and times in Javascript

Question

I want to generate a random date between two dates and between two times in javascript. For instance I want to generate a random date (between 8 am and 6 pm) between today a

Answer 1

Try this:

function getRandomDate(from, to) {
    from = from.getTime();
    to = to.getTime();
    return new Date(from + Math.random() * (to - from));
}

When creating a date you can set a time also:

var d = new Date(year, month, day, hours, minutes, seconds, milliseconds);

If you want the date to be, for example, between 8 am and 6 pm, simply set a random time after you get a random date.

So in this case the function would look like this:

function getRandomDate(fromDate, toDate, fromTime, toTime) {
    fromDate = fromDate.getTime();
    toDate = toDate.getTime();
    fromTime.setFullYear(1970,0,1); //reset the date
    toTime.setFullYear(1970,0,1); //because we only want a time here
    fromTime = fromTime.getTime();
    toTime = toTime.getTime();
    randomDate = new Date(fromDate + Math.random() * (toDate - fromDate));
    randomTime = new Date(fromTime + Math.random() * (toTime - fromTime));
    randomDate.setHours(randomTime.getHours());
    randomDate.setMinutes(randomTime.getMinutes());
    randomDate.setSeconds(randomTime.getSeconds());
}