List the time zones, set working hours, and see when everyone overlaps over the next few weeks, including the weeks when one country has changed its clocks and the other hasn't yet.
curl 'https://tz.wickkit.cc/?z=Europe/London&z=America/Chicago&from=2027-03-08' curl 'https://tz.wickkit.cc/api?z=Asia/Tokyo@10-19,America/Los_Angeles&weeks=2' # JSON curl 'https://tz.wickkit.cc/?z=America/Los_Angeles,Europe/London&year=2027' # whole year curl 'https://tz.wickkit.cc/ics?z=America/Los_Angeles,Europe/London&year=2027' # calendar of the changes
Time zones are IANA names (Europe/Berlin, Asia/Kolkata). Hours are each person's local time; days are each person's local weekdays.
Results are grouped into stretches of days with the same meeting times; a stretch that starts because a clock changed is marked in orange. A week or more with no shared time at all is listed too. Up to 6 zones and 12 weeks, or a whole calendar year
(year=2027: one row per stretch).