World Time Planner
Compare timezones across multiple cities on a visual 24h timeline. Automatically find the best meeting window, handles DST, syncs to URL, and share meeting times in one click.
How to use
- 1Search and add the cities you want to compare
- 2Click any hour column to see the corresponding time in all cities
- 3Green zones = business hours overlap — these are your best meeting windows
- 4Click "Copy Meeting Time" to share or "Add to Calendar" to schedule
- 5The URL updates automatically so you can share the link with your team
Frequently Asked Questions — World Time Planner
What is EST timezone?+
EST (Eastern Standard Time) is UTC-5, used on the US East Coast (New York, DC, Miami) during winter. In summer, this region switches to EDT (Eastern Daylight Time, UTC-4) due to Daylight Saving Time. This tool automatically detects and handles DST transitions, so you never need to calculate manually.
How do I schedule a meeting with someone in the USA from Vietnam?+
Add "Ho Chi Minh City" (UTC+7) and "New York" (UTC-5 winter / UTC-4 summer). The tool will show all hours side by side. The green business-hours overlap will highlight the best windows automatically. Typically, 8-10 AM New York time = 8-10 PM Ho Chi Minh City — a tough but workable overlap.
Why does London's time change in March?+
The UK observes British Summer Time (BST, UTC+1) from late March to late October, and GMT (UTC+0) the rest of the year. The change happens on the last Sunday of March (clocks go forward 1 hour) and the last Sunday of October (clocks go back). This tool uses the IANA timezone database and Intl.DateTimeFormat API to handle this automatically.