Create focused groups
Save multiple groups with 2–6 participants and their own IANA time zones.
River Apps · iPhone · US$0.99
Find a time that works across time zones.
Compare local working hours for 2–6 people, find shared windows for future dates, and review every result in each participant's own time zone.
Shared window3 hours
Friday, July 24
Alice · New York09:00–12:00
Bob · London14:00–17:00
What it does
Availability everyone can read locally.
Set real availability
Choose work days and local start and end times, including cross-midnight schedules.
Search future dates
Select a date range and minimum duration to find windows where everyone is available.
Review every local time
Expand a result to see each person's local date, time, time-zone label, and UTC offset.
Copy or share clearly
Copy or share a plain-text summary after reviewing the result.
See DST conflicts
Ambiguous or missing civil times are shown visibly instead of being silently guessed.
Who it is for
Remote teams, collaborators, families, and friends.
Overlap Hours is designed for people who coordinate across locations and want a shared window without manually converting every participant's schedule.
Time-zone rules can change. Confirm critical meetings with every participant, especially near daylight-saving transitions.
How it works
Four steps to a shared window.
- 1
Create a group
Name the group and choose a future date range.
- 2
Add people
Set each person's time zone, work days, and local hours.
- 3
Find overlaps
Choose the minimum duration and calculate shared windows.
- 4
Review and share
Check every local time before copying or sharing the result.
Private and offline
Your groups stay on your device.
Group names, participant names, time zones, availability, and search settings are stored only on your device. There is no account, cloud sync, analytics, advertising, or tracking.