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Time Zone Converter

Shift a wall-clock time from one IANA timezone to another — DST handled via real zone offsets, with day-shift flags when the date rolls over. Free, local, no signup.

100% Local Browser Native

How to Use the Time Zone Converter

1. Enter time + zones

Wall-clock time plus From and To IANA zones (datalist assisted); Now fills current time, ⇄ swaps.

2. Read the shift

Converted HH:MM with (+Nd) day-shift flags; invalid zone names refuse with examples.

3. Export

Download the conversion as JSON for records.

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Frequently Asked Questions

What exactly does it convert?

A wall time in a From zone to the same instant in a To zone — e.g. 12:00 UTC → 07:00 America/New_York (EST). Offsets come from the Intl database, so DST is correct without hardcoded rules.

Does it show overlap windows or share lists?

No — one conversion at a time, no multi-party overlap view and no invitee list.

What if my conversion crosses midnight?

Day shifts flag explicitly: 23:00 UTC → 18:00 New York same day shows nothing extra, while eastward jumps gain (+1d). Invalid zone names fall back to examples.

Is my schedule uploaded?

No — conversion runs locally in your browser. Nothing leaves your device.

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Last updated October 2026