How This Tool Works
The Time Zone Meeting Planner helps you find overlapping working hours across multiple time zones. Instead of doing mental math ("if it's 9 AM here, that's... 4 PM there? 5 PM?"), this tool shows you a visual timeline and a clear table of all possible meeting times.
Data Sources
Timezone data comes from the IANA Time Zone Database (tzdata), the same database used by Linux, macOS, and most programming languages. The IANA database is maintained by volunteers and updated regularly to reflect changes in daylight saving rules and timezone boundaries worldwide.
City-to-timezone mappings are curated from geographic data sources. The city database covers major cities worldwide and is designed to make it easy to find your location. Timezone abbreviations (like EST, CEST, JST) follow IANA conventions.
Daylight Saving Time
The planner tracks DST transitions for all applicable timezones. When you add a location, it automatically checks whether DST is currently active and adjusts the current time and working hours accordingly. If a DST transition is coming within the next 30 days, you'll see a warning banner so you can plan ahead.
Important: DST transition dates are pre-computed for 2026. Some regions change their DST rules on short notice — we update the data quarterly to reflect any changes.
Working Hours
By default, working hours are set to 9:00 AM – 5:00 PM for each location. You can customize these per location using the dropdown menus on each city card. The timeline and meeting times update instantly.
Privacy
This tool runs entirely in your browser. No data is sent to any server — your selected cities and working hours never leave your device. See our Privacy Policy for details.
Limitations
This is a static planning tool. It doesn't connect to your calendar or send invitations — it's designed to give you a quick visual reference for planning meetings. Always double-check times before scheduling, especially near DST transitions.
Ready to plan a meeting? Go to the planner →