01Writing · Tag

Articles tagged "intl-api".

At a glance
Articles
1
Published
Mar 2026
Reading time
7 min
In series
0

Articles tagged intl-api

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.

02Narrow it down

All articles