Free time zone converter
Pick a source time zone and wall-clock time, then see the same instant in another zone. Uses your browser Intl database for daylight saving — no server upload.
How to use this tool
- 1
Open time zone converter
Choose source and destination IANA zones.
- 2
Enter wall-clock time
Type the local date/time in the source zone or click Now.
- 3
Read converted time
Copy the target zone result or note UTC for logs.
Quick facts
| Runs locally? | Yes — Intl time zone data in your browser. |
|---|---|
| Is anything uploaded? | No. Date, time, and zones stay in this tab. |
| vs Unix timestamp? | Unix tools convert epoch seconds; this converts civil time between named zones. |
| DST? | Offsets follow IANA rules via Intl (same as modern browsers). |
Top use cases
- Convert civil date/time between IANA time zones — DST-aware, runs locally in your browser.
- Runs locally?: Yes — Intl time zone data in your browser.
- Is anything uploaded?: No. Date, time, and zones stay in this tab.
- vs Unix timestamp?: Unix tools convert epoch seconds; this converts civil time between named zones.
- DST?: Offsets follow IANA rules via Intl (same as modern browsers).
FAQ
Which zones are supported?▾
All IANA zones your browser exposes (e.g. America/New_York, Asia/Tokyo, UTC).
Why not type UTC+8?▾
Fixed offsets ignore daylight saving; named zones handle DST automatically.
What about leap seconds?▾
Same as JavaScript Date — POSIX-style timestamps without leap-second jumps.
Meeting in two cities?▾
Set source zone and local time, then read the target zone card.
Is UTC shown?▾
Yes — ISO UTC and Unix seconds appear below the converted times.
Offline?▾
Works offline after the page loads; zone data ships with the browser.