Meeting Time Across Time Zones Calculator
Convert your preferred meeting time into a participant's local time and check whether it falls within business hours. Ideal for remote teams scheduling calls across continents.
Last updated: September 2026
Formula below · 2 sources (iana.org, Wikipedia) · Updated Sep 2026
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About this calculator
When coordinating meetings globally, you need to translate your local time into each participant's local time by applying the UTC offset difference between the two zones. The core conversion is: target_hour = (meeting_hour + (target_offset − organizer_offset)) mod 24. The offsets are looked up for each named time zone (for example America/New_York or Asia/Tokyo) from the time-zone database as of today's date, so daylight saving time is applied automatically: New York to London is 5 hours for most of the year but 4 hours for a few weeks in March and late October/early November, when the US and UK change clocks on different dates. For a meeting weeks away, check whether either zone changes clocks before then. The result is a clock hour; the bands show whether it falls in the participant's business hours (09:00-17:00), early morning, evening, or overnight. The modulo-24 arithmetic wraps the result correctly across midnight.
How to use
Suppose you are in London and want to meet at 14:00 with a participant in Tokyo. Tokyo is 9 hours ahead of London in winter (UTC+9 vs UTC+0) and 8 hours ahead while the UK is on summer time. Converted: 14 + 9 = 23:00 Tokyo time in winter (22:00 in summer). That is outside Tokyo business hours, so consider an earlier London slot such as 08:00 (= 17:00 Tokyo in winter). With the defaults, 14:00 in New York is 19:00 in London for most of the year.
Frequently asked questions
How do I find a meeting time that works for both Europe and the US West Coast?
The UTC offset gap between London (UTC+0) and Los Angeles (UTC−8) is 8 hours, leaving a narrow overlap. A 09:00 London meeting is 01:00 in LA — outside business hours. A 17:00 London slot converts to 09:00 LA, which is the most practical overlap. Use the calculator's bands to compare candidates: aim for a converted time in the participant's 09:00-17:00 business hours.
Does the calculator account for daylight saving time?
Yes. Each option is a named time zone (such as Europe/London or Australia/Sydney), and the calculator looks up both zones' current UTC offsets, including daylight saving time, as of today's date. Because the US, Europe and Australia change clocks on different dates, the gap between two cities can change by an hour for a few weeks each spring and autumn; if your meeting is weeks away and falls on the other side of a clock change, re-check it closer to the date.
Why does the calculator add 24 before applying the modulo operation?
UTC offset arithmetic can produce negative intermediate values — for example, subtracting an 8-hour westward offset from a small hour like 06:00 gives −2. Adding 24 before the mod 24 operation shifts any negative result into a valid 0–23 range without changing positive results. This is a standard technique in clock arithmetic to prevent errors when times wrap backwards past midnight.