How to use
- Add cities or time zones.
- Pick a date and drag across the hour grid; working hours are shaded per zone.
- Copy the times or download a calendar invite.
Worked example
On 15 January 2026, 14:00 in London (GMT) is 09:00 in New York (EST) and 19:30 in Mumbai (IST).
Supported formats and limits
| Input | Date, time and IANA time zones |
|---|---|
| Output | Converted times, overlap grid, ICS invite |
| Engine | Intl.DateTimeFormat with the browser's IANA time-zone database |
Limitations
- Time-zone rules come from your browser and are as current as your browser's data.
Questions
How are daylight-saving changes handled?
Each row is converted with the time-zone rules built into your browser for the date you pick. On a change day that zone has 23 or 25 hourly columns. Always check the actual meeting date, because offsets differ across the year.
What does the share link contain?
The zones, their labels and working hours, the selected time in UTC, the duration and the title, written in the link's query string. Anyone with the link sees the same comparison; nothing is stored in an account.
Can I send the meeting to a calendar?
Yes. You can copy a text summary with the time in every zone or download an .ics file for the selected slot.
Guides
Privacy
Runs on your device. Files and text are processed in this browser tab and are not uploaded.
See the privacy policy for how toolsdocks handles data.