Timezone Overlap Finder
Free online timezone overlap finder for distributed and remote teams. 100% client-side, DST-aware, no signup.
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What is Timezone Overlap Finder?
The Timezone Overlap Finder is a free, browser-based tool that shows distributed teams the exact hours when every member is simultaneously available. You add teammates with their IANA timezones, set the standard working-hours window, and the tool computes the UTC windows where all members overlap - then translates that window into each persons local time.
Key Benefits
- Stops the back-and-forth of "what time works for you?" across many zones
- DST-aware via the native Intl API, so offsets are always correct for the chosen date
- Visual 24-hour matrix makes overlap and gaps obvious at a glance
- One-click copy of a ready-to-share meeting summary with every members local time
- 100% client-side - nothing about your team is ever uploaded
Common Use Cases
- •Scheduling a recurring standup across Bangkok, London, and New York
- •Picking a single global all-hands slot for a follow-the-sun engineering org
- •Coordinating an on-call handoff so no one gets paged outside working hours
- •Planning a client call across APAC, EMEA, and Americas timezones
- •Visualizing async collaboration windows for a fully remote team
How to Use the Timezone Overlap Finder
- Add your team members: Type a name for each teammate and pick their IANA timezone from the grouped dropdown. Add as many as you need.
- Set working hours and date: Choose the start and end of your working day, and pick the date to check. Offsets update automatically, including DST.
- Read the best meeting slot: The tool highlights the longest UTC window where everyone is on the clock, with each members local time shown next to it.
- Copy the summary: Click Copy to grab a ready-to-share text block listing every members local meeting time, then paste it into your calendar invite.
Key Features
- Add unlimited team members, each with a real IANA timezone from 400+ zones
- Custom working hours per team to respect different work schedules
- Auto-detects the best overlapping slot with the longest contiguous window
- Interactive 24-hour matrix shows each members local hour in every UTC slot
- DST-aware offsets computed live with the native Intl API - no stale tables
- 100% client-side - your team data never leaves the browser
Frequently Asked Questions
How does the Timezone Overlap Finder compute offsets?
It uses the browsers native Intl.DateTimeFormat API, which reads the full IANA timezone database. That means daylight saving time (DST) and historical rule changes are handled automatically for the date you select - there is no hardcoded offset table to go stale.
Is my team data sent to a server?
No. The entire tool runs 100% client-side in your browser. No names, timezones, or schedules are uploaded, stored, or logged anywhere. You can safely use it for confidential reorg or hiring planning.
What does "best meeting slot" mean?
The tool finds all UTC hours where every member is inside their working-hours window, then selects the longest contiguous run of those hours. If multiple runs tie, the earliest one is shown. If no overlap exists at all, it tells you so.
Can I handle teams where people have different working hours?
The current version applies one shared working-hours window to the whole team (the common case for a standup or all-hands). For per-person custom hours, set the window to the broadest range anyone might be available, then eyeball the green cells in the 24-hour grid.