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Time Zone Converter

Convert one moment into every timezone you care about at once: pick a date, time and source zone and read the wall-clock time, date, UTC offset and day difference for each target zone, with a working-hours band that shows where the day overlaps for a meeting. Handles daylight saving. Runs in your browser.

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What this tool does

Enter one instant — a date, a time and the timezone that time is written in — and the tool shows that same instant in every timezone you add. It is built for scheduling across a team that is spread across continents.

What each card shows

The large clock is the local wall-clock time in that zone. Below it are the local date, the UTC offset in effect on that date (daylight saving included), the timezone abbreviation, and a badge telling you whether the day is the same, one ahead or one behind the source. A green badge means the moment falls inside normal working hours (08:00 to 18:00).

The overlap band

Each card carries a 24-segment strip for that zone's local day. Working hours are shaded and the selected hour is marked. Scan the strips down the column and the block where every zone is shaded is the window that suits everyone.

Daylight saving

Offsets are computed for the specific date you pick, so a meeting planned for a date after a clock change shows the offset that will actually be in force then.

Privacy

All conversion happens in your browser. Nothing is uploaded.

FAQ

Frequently asked questions

How do I add a timezone?
Type an IANA name such as "Europe/London" or "Asia/Tokyo" into the add box and press Add. Your list is saved in the browser for next time.
Does it handle daylight saving?
Yes. The UTC offset shown for each zone is the offset in effect on the date you selected, not a fixed year-round value, so a conversion for a summer date and a winter date can differ.
What does the "+1 day" badge mean?
It means that at the chosen instant the local calendar date in that zone is one day ahead of the source zone. "-1 day" means it is one day behind.
What counts as working hours?
The band and the green badge treat 08:00 to 18:00 local time as working hours. It is a rough guide for finding an overlap, not a fixed rule.
Why does the source time not change when I switch source zone?
The date and time you type are interpreted as wall-clock time in whatever source zone is selected, so changing the source zone changes which instant that clock time refers to, and every target card updates.
Is any data sent to a server?
No. The conversion, the badges and the band are all computed locally in your browser.
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