Time zone meeting planner
Choose up to four cities, a date and the meeting length. The planner finds the times when everyone is within working hours and shows them in each local time – including daylight saving changes and half-hour zones such as India.
How it is calculated
How the planner finds the best meeting time
Each location has a working-hours window (9 am to 5 pm local time by default). The planner converts every window to one common time scale, Coordinated Universal Time (UTC), and checks every 15 minutes whether a meeting of the chosen length fits completely inside each window. The date applies at the first location, and its calendar day is searched from midnight to midnight.
Formula: local time = UTC + offset, so UTC = local time − offset. The offset (for example −4 hours for New York in summer) is read for the exact moment from the IANA time zone database built into every browser. The overlap is the intersection of all windows in UTC.
If no time suits every location, the planner shows the windows in which the most locations are at work at the same time and names those outside their working hours.
Worked example: New York, London and Chicago on 7 October 2026
| Location | Offset | 9:00–17:00 local in UTC |
|---|---|---|
| New York (EDT) | UTC−4 | 13:00–21:00 |
| London (BST) | UTC+1 | 08:00–16:00 |
| Chicago (CDT) | UTC−5 | 14:00–22:00 |
All three overlap from 14:00 to 16:00 UTC – two hours. That is 10:00–12:00 in New York, 15:00–17:00 in London and 09:00–11:00 in Chicago. The earliest one-hour meeting is 10:00–11:00 New York time. These are the default values shown when the page opens.
Daylight saving time: Europe and the US change on different dates
In the US, daylight saving time runs from the second Sunday in March to the first Sunday in November (15 U.S.C. § 260a); states lying in a single time zone may opt out, which is why Phoenix stays on UTC−7 all year. In the EU it starts on the last Sunday in March and ends on the last Sunday in October, at 01:00 UTC (Directive 2000/84/EC). In 2026 New York changes on 8 March, Berlin and Paris on 29 March; in autumn Europe changes on 25 October, the US on 1 November. In those weeks New York is 5 hours behind Berlin instead of 6.
Example: 9–17 in Berlin and 9–17 in New York overlap from 15:00 to 17:00 Berlin time (2 hours) on 2 March 2026, but from 14:00 to 17:00 (3 hours) on 16 March. South of the equator (Sydney, for instance) summer time falls in the northern winter. On the changeover day itself the day has 23 or 25 hours, so the hourly table shows one row fewer or more.
Half-hour and 45-minute time zones
Not every zone is a whole number of hours from UTC: India (Mumbai, New Delhi) is UTC+5:30, Nepal (Kathmandu) UTC+5:45, Newfoundland (St. John’s) UTC−3:30 in winter and Adelaide UTC+9:30, or +10:30 in the southern summer. That is why the planner works in quarter-hours. Example on 7 October 2026 with Berlin, Mumbai and Kathmandu (9–17 each): the shared time is 09:00–13:15 Berlin time, 4 hours 15 minutes. At 9:00 in Berlin it is 12:30 in Mumbai and 12:45 in Kathmandu.
Custom time zones and night shifts
If a city is missing from the list, choose "other time zone" and enter its IANA ID, such as America/Bogota or Asia/Manila. An end time before the start time (for example 22:00–06:00) is treated as a window across midnight. The planner does not know public holidays or non-Saturday/Sunday weekends; it only warns when the slot falls on a Saturday or Sunday somewhere.
Frequently asked questions
How do I find a meeting time across several time zones?
Enter the cities and their working hours: the planner converts all windows to UTC and shows where they overlap. For example, 9–5 in New York, London and Chicago overlaps from 10:00 to 12:00 New York time in October.
What is the best time for a meeting between the US and Europe?
Usually the US morning: with 9–5 working hours, New York and London overlap from 9:00 to 12:00 New York time for most of the year, because London is 5 hours ahead. The US West Coast and Central Europe share no regular working hours at all.
Does the planner handle daylight saving time?
Yes. Each city’s offset is read from the IANA time zone database for the chosen date, so the weeks in which Europe and the US change clocks on different dates (in 2026: 8–29 March and 25 October–1 November) are correct too.
Why can’t I find a slot for New York, London and Tokyo?
Tokyo’s 9–5 is 00:00–08:00 UTC, while New York works 13:00–21:00 UTC in summer. Any time for all three is outside 9–5 somewhere. Extend the working hours considerably – with New York starting at 7:00 and Tokyo working until 21:00, 07:00–08:00 New York time works in October (12:00 in London, 20:00 in Tokyo) – or split the meeting.
What does (+1) mean in the hourly table?
At that location the time is already on the next day; (−1) means still the previous day – both compared with the date at the first location. At 11 pm in London it is already the next morning in Tokyo.
What is an IANA time zone?
The IANA time zone database is the reference list of the world’s time zones and their daylight saving rules, used by operating systems, browsers and calendar apps. Every zone has an Area/City ID such as America/New_York, Europe/London or Asia/Kolkata.
Sources and legal basis
- IANA Time Zone Database (tz database)
- ECMAScript Internationalization API – Intl.DateTimeFormat, Option timeZone (ECMA-402)
- Directive 2000/84/EC on summer-time arrangements (EUR-Lex)
- 15 U.S.C. § 260a: U.S. Code – daylight saving time (second Sunday in March to first Sunday in November)
As of:
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