Timezone Converter
Enter a date and time and see that same instant displayed in a target time zone, with daylight saving applied automatically.
How to use this tool
- 1
Pick a date and time in the datetime-local field; it defaults to right now and is read as your computer's local time.
- 2
Choose a destination zone from the 'To' dropdown (UTC plus 12 common city zones across the Americas, Europe, Asia and Australia).
- 3
Read the converted full date and time shown in the highlighted box below, formatted in US English.
- 4
Adjust the date to a different day if you want to check how daylight saving shifts the result.
How does this timezone converter actually work?
This tool takes the wall-clock time you type into the datetime-local field, interprets it as your own browser's local time zone, and then re-displays that same physical instant in the zone you pick under 'To'. It is built entirely on the browser's native Intl.DateTimeFormat with a timeZone option, so it reads daylight saving and offset rules from the IANA tz database that your browser ships and keeps updated — no fixed offsets are hard-coded. One important honesty note: the 'From' dropdown is shown but does not affect the output. The source instant is always assumed to be your local machine time because the code parses the input with new Date(), which treats a datetime-local string (no offset) as local time. The result is also always rendered in en-US locale and shows only the target zone, not a side-by-side comparison. That makes this a solid local-time-to-target-zone viewer rather than a true arbitrary zone-to-zone calculator. For converting between two zones that are both different from your own, or for server-side scheduling logic, reach for a dedicated library such as Luxon or date-fns-tz.
Common use cases
Check what time your 3pm local call lands at for a colleague in Tokyo, Berlin, or Sydney.
Confirm the UTC equivalent of a local deadline before filing it in a ticket or changelog.
See whether a date you picked falls inside daylight saving by comparing two nearby dates.
Translate a webinar start time from your local clock into a US Eastern or Pacific figure for an announcement.
Sanity-check a cron or batch-job time you reason about in local terms against UTC.
Plan a flight or call window by reading your departure-local time as it appears in Asia/Kolkata or America/Sao_Paulo.
Frequently asked questions
Why doesn't changing the 'From' dropdown change the result?▼
Does this handle daylight saving time?▼
Which time zones can I convert to?▼
What time zone is my entered time assumed to be in?▼
Why is the output always in US English formatting?▼
Is my data sent anywhere?▼
Should I rely on this for production scheduling?▼
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