What it does
This converter takes a date and time in one time zone and works out the equivalent date and time in another, handling daylight saving automatically. Pick a "from" zone and a "to" zone, enter a date and time, and the result updates as you type — including flagging when the converted time falls on the previous or next calendar day. Everything runs in your browser using its built-in time zone database; nothing is sent anywhere.
How it works
Time zones aren't fixed offsets — most observe daylight saving, and the date they switch varies by country, so the gap between two places can change through the year. The converter reads your date and time as a local moment in the "from" zone, works out precisely which instant in time that represents (taking that zone's daylight-saving rules on that specific date into account), and then re-expresses that same instant in the "to" zone's local time. That's why converting the same clock time in July and in March between London and New York can give different results: the UK and US do not start and end daylight saving on the same dates.
The underlying zone data (the IANA/tz database) is built into every modern browser, so results stay accurate as daylight-saving rules change without the tool needing updating.
Worked example
Take 14:00 on 2024-07-15 in Europe/London. Converted to America/New_York, that's 09:00 on 2024-07-15 — both places are in summer time on that date, five hours apart.
Common uses
- Scheduling calls and meetings: working out a sensible time for people in different countries.
- Travel planning: checking arrival times or when to call home after crossing time zones.
- Remote work: converting a colleague's local working hours into your own.
- Live events: working out your local start time for a broadcast, launch or stream scheduled elsewhere.
- Deadlines: confirming what a deadline given "end of day" in another time zone actually means for you.
Frequently asked
Does it account for daylight saving time?
Yes. The conversion is worked out for the exact date entered, using each zone's real daylight-saving rules for that date — not a fixed year-round offset.
Why is the gap between two zones sometimes different at different times of year?
Countries don't all start and end daylight saving on the same date. For part of the year both zones may be on summer time, for part of the year both on standard time, and for a few weeks only one of them has changed — which shifts the gap between them by an hour.
Why does the result show a different date to the one I entered?
Large time differences can push the converted time past midnight in the target zone. The tool shows "next day" or "previous day" next to the result whenever the conversion crosses a calendar-day boundary.
What if a time zone uses a half-hour or 45-minute offset?
Those are handled the same way as whole-hour zones — India Standard Time, for example, is a fixed UTC+5:30, and the result reflects that precisely.
You can read how every ToolHare tool is checked on the how we build and verify tools page.