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Articles tagged "timezone-handling".

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Mar 2026
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Articles tagged timezone-handling

7 min javascripttypescripttimezone-handling

Silent timezone bugs in JavaScript date arithmetic

`new Date().toISOString().split('T')[0]` returns the UTC date, not the user's local date. The bug, the fix, and why it only shows up in production.

I logged six hours on Thursday and they’re showing up under Wednesday.

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