How to Use the Time Zone Meeting Overlap Calculator
Scheduling a call with an overseas office or a remote teammate always starts with the same problem: figuring out the time difference. This calculator takes your time zone and the other person's time zone as UTC offsets (for example, US Eastern is UTC-5, India is UTC+5.5) and automatically finds the window that falls within standard business hours (9am-6pm) for both sides, shown in each zone's local clock.
Doing this math by hand is easy to get wrong because of date-line crossings and daylight saving time (DST) changes, and when the time difference is 12 hours or more, business hours may not overlap at all. This calculator checks both time zones in 30-minute increments to pinpoint the exact overlapping window, so you can confirm feasibility before you even open a scheduling tool.
If it turns out there's no overlap, don't worry — you can still make a meeting work by having one side join early morning or late evening, or by shifting that particular conversation to asynchronous channels like email or a shared doc instead of a live call.
Frequently Asked Questions
It assumes a standard 9-hour workday, 9am to 6pm, and finds the time window that falls inside those hours in both time zones simultaneously.
When the time difference is 12 hours or more, business hours may not overlap at all. In that case, consider having one side join early morning or late evening, or switch to asynchronous communication instead.