Assuming you are using client side javascript, you need to call either GET or HEAD on the file you want the date from, and than pull the date out of the response.

Luxon is a modern lightweight library for parsing, validating, manipulating, and formatting dates in JavaScript.

JavaScript - Only Display HTML if = Certain Date Flea2k Mar 9, 2005 Jump to latest Follow Reply ...

Beyond the usual quick tips, let's look at both the business case and the technical side of keeping React bundles lean.