I made <https://github.com/treeform/chrono> specifically to deal with dates and time zones in JavaScript. It might help you out.
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- Client-side JS with Nim jasonfi
- Client-side JS with Nim xigoi
- Client-side JS with Nim jasonfi
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- Client-side JS with Nim alexeypetrushin
- Client-side JS with Nim alexeypetrushin
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