Overlap
Working Hours Overlap Finder
Compare preference windows
Default hours 09:00–17:00 and Monday–Friday are editable examples, not universal business hours. The tool compares preferences only and does not read personal calendars.
Overnight shifts
If start is later than end, the interval continues past midnight as elapsed time. Intersection is computed on instants, then shown in each zone. Use the meeting planner once you have a window.