Compare if 2 dates are the same in javascript

Question

var beginningTime = moment('1635750314812', 'YYYY/MM/DD'); // Today date var endTime = moment(undefined, 'YYYY/MM/DD') // Today date console.log(beginningTime.isSame(endTime)); //expect true

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>

I am using moment js to get if 2 date are the same using the above pattern. But now i get false instead of true. How to solve the issue?

moment('1635750314812', 'YYYY/MM/DD') means parse 1635750314812 assuming it is in YYYY/MM/DD format. Which it's clearly not. — deceze
– deceze ♦, Commented Nov 1, 2021 at 7:55
'YYYY/MM/DD' is supposed to inform Moment about the format of the first argument. moment('1635750314812', 'YYYY/MM/DD') means : "Hey Moment, I'm informing you that '1635750314812' is in format 'YYYY/MM/DD'). Moment is like 'Wat?' and produces an invalid Moment object. Log it, it says _isValid:false. — Jeremy Thille
– Jeremy Thille, Commented Nov 1, 2021 at 7:56

AgentM · Accepted Answer · 2021-11-01 08:27:39Z

Instead of formatting the beginningTime and endTime separately, you should take a look at the 'granularity' argument for isSame().

I made a few adjustments to your code for it to work, and also look cleaner.

var beginningTime = moment(1635750314812); // Today date (from timestamp) var endTime = moment() // Today date console.log(beginningTime.isSame(endTime, 'day')); //expect true

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>

It first simply creates a moment of your timestamp and a moment of right now, whenever now is. Then it will compare the two moments with a granularity of a day, effectively checking if the day and everything bigger (month, year) is the same.

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