Where can I learn about Dates/Timestamps?

Where can I learn about dates and timestamps? My goal is to learn enough to be confident on making/using any date/timestamp. The general information seems to be very fragmented when going to JavaScript MDN docs or googling date/timestamp.

It seems UTC is the thing to really read up on?

I would also like to use the industry best practice for storing timestamps and in general understand what i'm doing with timestamps .

I'm mainly working with JavaScript on the client and server and am using MongoDB as a database but any general knowledge would be preferable.