Is there any way to automatically collect GMT offset timezone data into a custom field?

I’m trying to pass this data collected from my Infusionsoft form into a custom field into EverWebinar, which only accepts timezone data in the form of GMT offset, e.g. GMT+8, GMT+4:30, etc. Is there any script out there that would make this possible? I’ve previously used scripts like the one found here https://blog.novaksolutions.com/tips/automatically-get-your-visitors-time-zone/ to collect timezone data into a hidden field, but it populates with values such as “America/Chicago” or “Europe/Berlin.” I can’t seem to find on which would grab GMT offset timezone data anywhere.

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