Zurich is 4.75 hours behind Kathmandu
Best overlap: 12:45 PM to 6:45 PM in Kathmandu is 8:00 AM to 2:00 PM in Zurich.
Your shared working hours run 12:45 PM to 6:45 PM in Kathmandu (8:00 AM to 2:00 PM in Zurich). Zurich is 4.75 hours behind Kathmandu, and with 6 hours of overlap you can even run back-to-back calls without stepping outside business hours. Because only Zurich changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Zurich enters or leaves daylight saving.