Those abbreviations are ambiguous—use IANA IDs like America/Los_Angeles or Asia/Shanghai.

Isn't a fixed offset a timezone?

UTC-05:00 is just an offset; America/New_York includes DST rules that change offsets through the year.

Does it handle daylight saving?

Normal conversions include DST, but ambiguous local times are not manually resolved—be careful near transitions.

Date and Time

From Timezone

To Timezone

2026-03-18 09:00:00

UTC

UTC+00:00

2026-03-18 17:00:00

Asia/Shanghai

UTC+08:00

2026-03-18T09:00:00.000Z

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