Skip to main content
Castov
TIME ZONES

Business Hours Converter

Compare working hours between two or more time zones and find the overlap, if there is one.

Team 1
Team 2

Finding a meeting time across time zones

Give each team its time zone and working hours (for example 09:00-17:00), and this tool shows every team's window converted into a single reference zone, side by side, plus the exact overlap across all of them, if one exists. It is built for scheduling meetings and handovers between offices in different time zones.

Overnight and non-overlapping shifts

An end time earlier than the start time (such as 22:00 to 06:00) is treated as an overnight shift ending the next day. When the working hours genuinely do not overlap at all, the tool says so plainly instead of showing a confusing or empty result.

Want the background? Read our comprehensive guide: Time Zones and DST for Developers.

How to use this tool

  1. Pick a date to compare on, since offsets can depend on the date.
  2. For each team, choose its time zone and enter its working hours.
  3. Select Add a time zone for more than two teams.
  4. Select Compare hours to see each team's window and the overlap, if any.

Examples

Two teams' working hours, and the overlap between them.

New York, in London time

09:00–17:00 America/New_York

In London
09:00–17:00

Overlap

Both teams' 09:00–17:00 windows

Overlap (minutes)
180

London, in New York time

09:00–17:00 Europe/London

In New York
04:00–12:00

Frequently Asked Questions

What happens if the teams' hours never overlap?
The tool tells you plainly that there is no overlap on the date you chose, rather than showing an empty or misleading time range.
Can I compare more than two time zones?
Yes, add as many time zone rows as you need; the overlap is calculated across all of them at once.
What happens in the weeks around a daylight saving change?
Each zone's offset is calculated for the specific date you choose, so if two zones change on different dates, the tool correctly shows a different overlap during the weeks between those changes.
Can I compare an overnight shift, like 22:00 to 06:00?
Yes. If the end time is earlier than the start time, it is treated as ending the following day.

Related tools