Time Zone Converter
Calculators & Converters
Convert times across the world's time zones. DST-aware, UTC-offset display, full IANA zone list, and a Now button for the current moment.
Runs entirely in your browserAbout Time Zone Converter
Time zone conversion is a routine chore for anyone who works with people in other countries — scheduling calls, planning content drops, syncing servers, or just figuring out 'is it the weekend in Tokyo yet?'. The browser ships with the full IANA time zone database, which covers every named zone plus daylight saving rules, so this converter is as accurate as any heavyweight scheduling app.
Pick a 'from' zone and a 'to' zone, enter a wall-clock time, and the tool tells you what that exact instant looks like in both places. The from-zone input is interpreted as local time in that zone, then mapped to the destination — handling DST transitions and historical offsets correctly. UTC offsets (e.g. `+05:30`, `-08:00`) are shown for each zone so you can verify the difference. Click 'Now' for the current moment, and swap zones with one click for the reverse direction.
How to use
- 1
Enter a wall clock time
Type or pick a date and time. This is interpreted as local time in the 'from' zone.
- 2
Pick the from zone
Choose the time zone the entered time is in. The converter defaults to your local zone.
- 3
Pick the to zone
Choose the destination zone — the time zone you want to convert into.
- 4
Read the result
Both cards show the full localized date+time and the UTC offset. The destination card is the converted moment.
- 5
Use Now / Swap zones
'Now' fills the input with the current moment. 'Swap zones' reverses from and to for quick reverse lookups.
Examples
9 AM New York to Tokyo
Standard 'when am I scheduling this call' lookup.
Input
9:00 AM, America/New_YorkOutput
10:00 PM, Asia/Tokyo (same day or next day depending on DST)Converting from UTC
Useful for log timestamps or scheduling cron jobs.
Input
14:00 UTCOutput
10:00 AM America/New_York (EDT) · 7:00 PM Europe/London (BST)Frequently asked questions
How accurate is it across DST transitions?+
Very accurate. The browser uses the IANA time zone database, which knows the exact dates and rules for DST in every zone, historically and currently. Crossing a DST boundary works correctly.
What's the difference between EST and America/New_York?+
EST is just the winter standard time abbreviation (UTC-5). America/New_York covers both EST and EDT (daylight time, UTC-4) and switches automatically based on the date. Always use the IANA name (America/New_York, Europe/London, Asia/Tokyo) rather than abbreviations — abbreviations are ambiguous.
Why does the UTC offset change?+
Daylight saving — most zones shift by one hour twice a year. The offset shown is the actual offset at the chosen date/time, not just the standard one.
Does it handle historical times correctly?+
Yes — the IANA database includes historical DST changes. A date from 1990 converts using the rules that were in effect in 1990.
Is my time data uploaded?+
No. All conversion uses the browser's Intl.DateTimeFormat API.
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