Let’s say you have two Date objects DateOne and DateTwo. Now you want to find the difference between these two dates and show that in a human readable format; for example ‘the difference is 2 hours and 30 minutes’. How do you do it in Java?

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The obvious answer is, get the milliseconds from these two dates and find the difference. And, then manually convert these milliseconds into hours, minutes, seconds etc.

But, wait a second. There’s an easy way to do this using the TimeUnit class. TimeUnit represents time durations at a given unit of granularity and provides utility methods to convert across units, and to perform timing and delay operations in these units.

Have a look the below code which finds out the difference between two dates and returns them in the form of ‘h* hours and m minutes’*.

    public String getTimeDiff(Date dateOne, Date dateTwo) {
            String diff = "";
            long timeDiff = Math.abs(dateOne.getTime() - dateTwo.getTime());
            diff = String.format("%d hour(s) %d min(s)", TimeUnit.MILLISECONDS.toHours(timeDiff),
                    TimeUnit.MILLISECONDS.toMinutes(timeDiff) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(timeDiff)));
            return diff;

That simple, isn’t it?