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Timestamp is "2021-08-13 05:30:00" and I know that it is US Central Time. What I don't know is if it is DST or not. So without knowing that I cannot convert to UTC correctly. How would I use javascript to get UTC.

I know date and time and timezone (Central Time specifically), but I do not know if it is DST or not and I do not know it's timezoneoffet from zulu.

console.log(someFunction("2022-06-10 15:16:17", "US/Central Time Zone"));
> 2022-06-10 15:16:17 -6 // wrong
> 2022-06-10 15:16:17 -5 // correct because DST
  • Seems with javascript not natively understanding timezones, timezone names, and DST rules, there is no way to do this without external data and or functions. Which is not a big deal unless you have to process hundreds or thousands of these requests on the client side.

So, I'm looking at trying to get a offset reference once and applying that to all the client side needs. Or passing the clients timezone offset to the server and let the server figure it all out.

Kelly Cockerell
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    Does this answer your question? [How to check if DST (Daylight Saving Time) is in effect, and if so, the offset?](https://stackoverflow.com/questions/11887934/how-to-check-if-dst-daylight-saving-time-is-in-effect-and-if-so-the-offset) – Tushar Gupta Aug 13 '22 at 10:21
  • Did you check the duplicate?? – Alon Eitan Aug 14 '22 at 15:35
  • I do not think so, @Tushar. Or is not obvious. Biggest problem seems to be javascript does not know all the timezone and DST data. So I guess you always have to references something external - which then leads to: what is the best way to do that that is future proof and works cross-platform? – Kelly Cockerell Aug 14 '22 at 15:39
  • @AlonEitan I did. See my comment to @tushar? – Kelly Cockerell Aug 14 '22 at 15:41
  • I added example code to my question to show what I hope to get to. – Kelly Cockerell Aug 14 '22 at 15:43

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