Timezone Converter & Meeting Planner - Free Multi-City Time Zone Tool
Timezone Converter
Convert between time zones and find the best meeting times across cities.
Free online timezone converter and meeting planner for distributed teams. Add unlimited IANA time zones, view live clocks, drag a 24h timeline slider, and instantly find the best meeting overlap windows. Color-coded work-hours bands (sleep, early, work, evening) per city make scheduling visual. Copy a formatted local-time summary for meeting invites. Developer-friendly outputs: UTC offset, ISO 8601, Unix epoch, and RFC 2822 for every zone. Plan future dates with DST-aware transitions. Shareable URLs preserve your zone set and selected time. 100% client-side - no data leaves your browser.
Keywords: timezone converter, time zone converter, meeting planner time zones, timezone overlap finder, best time to meet across time zones, world clock online, multi timezone converter, timezone meeting planner, time zone comparison, utc to local time, dst converter, meeting scheduler time zones, free timezone converter, timezone converter for developers, unix timestamp timezone, iso 8601 timezone
Tags: timezone, meeting, planner, world-clock, time, convert, utc, dst, schedule
How to Timezone Converter Online
Click 'Add Timezone' or use Cmd+Shift+A to search and add any city or IANA timezone. Add as many as you need - there is no limit.
View all your timezones side by side with live clocks, color-coded work-hours bands, and UTC offsets. The 24-hour timeline shows sleep (dark), early (amber), work (green), and evening (orange) for each zone.
Drag the timeline slider to pick a specific time, or use the date/time picker to select a future date. All zones update simultaneously.
Check the Overlap panel for ranked meeting windows - the tool finds all time blocks where your selected zones' work hours align, ranked by the number of zones in work hours.
Click 'Copy Summary' (Cmd+Shift+C) to copy a formatted local-time summary for every zone - paste it directly into a meeting invite or Slack message.
Use the 'Share' button (Cmd+Shift+S) to generate a URL that preserves your exact timezone set and selected time. Anyone who opens the link sees the same view.
Expand 'Dev Outputs' on any timezone row to see ISO 8601, Unix epoch, UTC offset, and RFC 2822 for that zone - one-click copy for each format.
Timezone Converter Features
Unlimited timezone comparison - add as many IANA timezones as you need, no paywall or signup required.
Live clocks for every timezone row, updating every second with local time and date.
Draggable 24-hour timeline slider that updates all zones simultaneously - inspired by World Time Buddy's proven UX pattern.
Color-coded work-hours bands per city: sleep (night), early morning, work hours (default 9-17), and evening - making schedule conflicts instantly visible.
Ranked overlap windows: automatically finds and ranks all time blocks where multiple zones share work hours, with the best meeting times highlighted.
One-click 'Copy local-time summary' for meeting invites - generates a formatted list of each zone's local time for the selected moment.
Future date/time planning with full DST awareness - unlike everytimezone, you can schedule ahead and see accurate DST-adjusted times.
DST transition warnings: badges show which zones are currently in daylight saving time, with tooltip showing the next transition date.
Developer-friendly outputs per zone: ISO 8601, Unix epoch (seconds), UTC offset string, and RFC 2822 - each with one-click copy.
Shareable URL state: zones and selected time are encoded in the URL so you can share your exact view with teammates.
Searchable timezone picker with 400+ IANA timezones using the browser's built-in timezone database - search by city name or timezone identifier.
Configurable work hours: adjust the start and end hours (default 9:00-17:00) to match your team's actual schedules.
100% client-side: all computation uses native Intl.DateTimeFormat - no data is ever sent to a server. Completely private.
Keyboard shortcuts for power users: Cmd+Shift+N for now, Cmd+Shift+S to share.
Internal links to Timestamp Converter and Cron Parser for a complete datetime tool suite.
Frequently Asked Questions
- How many time zones can I compare at once?
- There is no limit. Unlike World Time Buddy (which limits free users to 3 zones), this tool lets you add as many IANA timezones as you need - completely free, no signup required.
- Can I plan meetings for future dates?
- Yes. Use the date/time picker to select any future date and time. The tool automatically accounts for DST transitions, so if a timezone switches between standard and daylight saving time before your meeting date, the displayed times will be accurate.
- How does the overlap finder work?
- The tool examines every hour of the day in UTC and checks which of your selected timezones are within their configured work hours (default 9:00-17:00) at that time. It then finds contiguous blocks and ranks them by a score: number of zones in work hours multiplied by duration of the block. The top-ranked window is highlighted as the 'Best meeting time'.
- What are the developer outputs?
- For each timezone row, you can expand a developer panel showing the selected time in four formats: ISO 8601 (e.g. 2024-05-14T10:00:00+05:30), Unix epoch in seconds, UTC offset string (e.g. +05:30), and RFC 2822 (e.g. Tue, 14 May 2024 10:00:00 +0530). Each has a one-click copy button.
- Is my data sent to a server?
- No. All timezone conversion and overlap calculation runs entirely in your browser using JavaScript's built-in Intl.DateTimeFormat API. No timezone data, city names, or meeting details are ever transmitted to any server.
- How do I share my timezone comparison?
- Click the Share button (or press Cmd+Shift+S) to generate a URL that encodes your selected timezones and reference time. Send this URL to anyone - they will see the exact same timezone comparison when they open it.
- Does it handle Daylight Saving Time?
- Yes. The tool uses the browser's built-in IANA timezone database which includes all DST rules. Each timezone row shows a DST badge when that zone is currently observing daylight saving time, and a tooltip shows the date of the next DST transition.