Create a ISO String from date text input intended for UTC date in JavaScript

Let’s say that you receive a date like “14/01/2022”, “14 January 2022”, “Jan, 14 2022” etc, and you need to convert this date to an ISO string in JavaScript while ensuring that the date that is inputted is for UTC (Universal Time Coordinated) timezone – no matter where you are in the world. It would seem easy right?

Your first reaction might be to simply do something like this:

Now unless you are sitting smack-dab in a UTC timezone you might be in for a bit of a surprise.

Right now, my timezone is UTC+11 hours. This means that my result of the code in the example above will report the previous day at 1pm UTC.

That’s not what I am looking for all. I need to set this date to precisely midnight of 14 Jan 2022 UTC time.

The ISO String we need is this: 2022-01-14T00:00:00.000Z

The Solution

Note! Parsing an ISO format (e.g. “2022-01-14”) using this approach will not work because it will already be set to UTC. Simply use new Date(dateString).toISOString(); in this case. 

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