How to get the time in a specific time zone?

Question

JavaScript

It is necessary for the period of Christmas holidays - from 00:00 24.12 to 00:00 27.12 to turn on the banner.
But the time must be obtained strictly according to the timezone, specifically for Berlin, and not for the user's computer.
Those. turn on when in Berlin 00 on the 24th and off when in Berlin 00 on the 27th.
Below is the simplest option, just without taking into account the timezone, for clarity, I did the opposite to turn it off these days, tell me what to add so that everything is correct.

Answer 1

https://jsfiddle.net/kickerock/x2tnw78g/14/