How to get the timezone version used by moment-timezone?

I am using moment-timezone for working with timezones in Node.js. I am wondering if there is a way to get the current timezone (file) version being used. For example, the latest IANA version at the time of writing this is 2021a.

I need to know this, so that I can update dateTimes in my database whenever a new version is released.

I read through all of the documentation, but I couldn't find it...

Solution

You can use moment.tz.dataVersion. It seems that this property is not mentioned in the docs page, but it is quite easy to get it looking at library code on github.

// Get momentjs version
console.log(moment.version);
// Get moment timezone version
console.log(moment.tz.version);
// Get data used
console.log(moment.tz.dataVersion);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.33/moment-timezone-with-data-2012-2022.min.js"></script>

This is similar to: How to console.log Moment.js version?.