I switched my timezone 3 weeks ago when I moved across the country. I used timedatectl as per the arch wiki. Everything worked fine except Java applications. Java applications use a file called /etc/timezone which you need to go and manually edit. I eventually stumbled across this thread which took me some time to find. Hopefully it helps some of you folks and we could document that on the endeavour wiki.
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Many of us here prefer to use the Arch Wiki for anything related to EndeavourOS.
In your case, It would have been this link:
https://wiki.archlinux.org/title/System_time
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The issue with this link is it never mentions the /etc/timezone file.
Uh ohh… excuse my Gibberish. 