Interactive Multi-City Time-Zone Overlap Calculator & .ics Generator
Select up to four global cities and any future meeting date. Our client-side IANA time-zone engine highlights Golden Overlap Hours, Stretch Windows, and overnight Off-Hours — then exports a standards-compliant .ics invite in one click.
24-Hour Multi-City Overlap Bar (Click Any Column to Select Slot)
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Shift Schedule Rotation Preview & .ics Exporter
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Compute Heat Index, Wind Chill, Go/Caution/Reschedule scores, and checklists for cycling, running, weddings, field ops, and sailing.
Frequently Asked Questions
What is a Golden Overlap Hour in cross-time-zone scheduling?
A Golden Overlap Hour is a 60-minute window that falls inside standard daytime working hours (such as 09:00–18:00) for every city on the call simultaneously, avoiding early-morning or late-night fatigue.
Why do meeting overlaps shift twice a year between the US, Europe, and Australia?
Different regions switch onto and off Daylight Saving Time on different Sundays (or not at all, like Japan and Singapore, or in reverse seasons like Sydney). Selecting your exact meeting date above computes accurate DST offsets automatically.
What should teams do when 3 or 4 cities have zero Golden Overlap Hours?
Use the amber Stretch Hours (07:00–08:59 or 18:00–21:00) and rotate which region takes the early or evening slot each week, or share asynchronous agenda notes inside your calendar invite.
How do I import the downloaded .ics meeting invite?
Open the downloaded .ics file on macOS, iOS, Windows, or Android to add the UTC-anchored event directly into Apple Calendar, Google Calendar, Outlook, or Cloud Calendars.