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Multi-Timezone Working-Hours Overlap Finder

· Last updated：2026-07-09

Find meeting windows where 2–6 participants across time zones are all working. Computes UTC intersection, ranks by comfort, exports .ics.

Details

What this tool helps you do

Find meeting windows where everyone is awake and on the clock — across 2 to 6 time zones.

What it does. You list each participant with their city (or IANA timezone, like America/Sao_Paulo) and their local working hours. The tool converts every participant's working window to UTC, finds the intersection where all of them are simultaneously working, removes lunch breaks, filters by shared working days, and ranks the resulting slots by how "civilized" the local time is for each person (nobody should be asked to join at 23:00).

How it ranks slots. Each overlap window gets a comfort score: the more participants for whom the slot falls inside 09:00–17:00 local, the higher it ranks. Slots that push anyone past 20:00 or before 07:00 local are flagged with a ⚠️ warning.

DST is handled. The tool uses the browser/runtime IANA timezone database via Intl.DateTimeFormat, so daylight saving transitions are respected for the week you analyze. Always pick the Monday of the week you care about — the analysis runs for 7 days from that date.

Export to calendar. The .ics file contains one all-day-style event per day for each overlap window, so you can drop it straight into Google Calendar / Outlook / Apple Calendar and see candidate times at a glance. Invitees are listed in the event description.

Tips.

  • If there's no overlap at all, try widening one person's hours by an hour, or switch a 5-day to a 6-day work week.
  • For US–Europe–Asia triads, the overlap is almost always in a narrow morning-UTC window; expect short slots.
  • City names that aren't recognized? Use the IANA key instead (Asia/Kolkata, Europe/Berlin, America/New_York).

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Written by the Elysia Tools team
Find40

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Utilities
Input types
textarea, text, select
Output type
html
Sample coverage
4
API ready
Yes

Overview

The Multi-Timezone Working-Hours Overlap Finder helps distributed teams schedule meetings by identifying overlapping working hours across 2 to 6 different time zones. By converting local working windows to UTC, accounting for lunch breaks, and filtering by shared working days, the tool ranks potential meeting slots by participant comfort and exports them directly to an .ics calendar file.

When to use

  • When scheduling a sync meeting for a remote team spread across multiple continents and time zones.
  • When you need to find a meeting slot that respects everyone's local working hours and avoids early mornings or late nights.
  • When planning recurring or one-off meetings during weeks with daylight saving time transitions.

How it works

  1. 1Enter your participants' names and cities or IANA timezones, then define the standard local working hours and optional lunch breaks.
  2. 2Select the working days configuration and specify the Monday date of the week you want to analyze.
  3. 3The tool converts all working windows to UTC, calculates the overlapping time slots, and ranks them based on local comfort scores.
  4. 4Review the ranked meeting windows and download the generated .ics file to import the slots directly into your calendar.

Use cases

  • Finding a viable 1-hour meeting window for a triad team in New York, Los Angeles, and London.
  • Scheduling a comfortable weekly sync for a distributed team across London, Berlin, and Mumbai.
  • Planning cross-border collaboration sessions for teams operating on different regional workweeks, such as Sunday-Thursday in the Middle East.

Examples

1. Scheduling a Europe and India Team Sync

Project Manager

Background

A project manager needs to schedule a weekly alignment meeting for team members located in London, Berlin, and Mumbai.

Problem

Manually calculating the overlapping working hours while avoiding lunch breaks and late-night calls for the team in India is time-consuming.

How to use

Enter the participants (Alice in London, Bruno in Berlin, and Priya in Mumbai), set the working hours from 09:00 to 18:00, add a lunch break from 12:00-13:00, and select the week starting 2026-07-13.

Participants:
Alice, London
Bruno, Berlin
Priya, Mumbai

Work Start: 09:00
Work End: 18:00
Lunch: 12:00-13:00
Working Days: weekdays

Outcome

The tool identifies a comfortable 4-hour overlap window in the morning UTC, ranks it highly for all participants, and provides an .ics file for easy calendar import.

2. Finding a Tight Window for US and UK Teams

Engineering Lead

Background

An engineering lead needs to coordinate a quick daily standup between developers in Los Angeles, New York, and London.

Problem

The significant time difference leaves a very narrow window where all three regions are online during their standard 09:00 to 18:00 working hours.

FAQ

How does the tool rank the meeting slots?

Slots are ranked by a comfort score: the more participants for whom the slot falls between 09:00 and 17:00 local time, the higher it ranks.

Does the tool account for daylight saving time (DST)?

Yes, it uses the browser's IANA timezone database to accurately calculate DST offsets for the specific week you select.

What should I do if no overlapping slots are found?

Try widening the local working hours, removing the lunch break, or changing the working days setting to include weekends.

Can I use specific city names or do I need IANA timezone keys?

You can use common city names. If a city is not recognized, use its standard IANA timezone key, such as America/New_York.

How do I import the results into my calendar?

Click the export option to download an .ics file, which you can then import into Google Calendar, Outlook, or Apple Calendar.

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How to use

Input the participants (Dana in New York, Eli in Los Angeles, and Finn in London), set the working hours to 09:00-18:00, leave the lunch break blank to maximize overlap, and run the analysis.

Participants:
Dana, New York
Eli, Los Angeles
Finn, London

Work Start: 09:00
Work End: 18:00
Lunch: [blank]
Working Days: weekdays

Outcome

The tool isolates a single, viable 1-hour overlap window at 16:00 UTC (17:00 London, 12:00 New York, 09:00 Los Angeles) and flags it as the only workable option.