Klockslag

Find out what a time is in some other timezones.

Example: I am planning an online meeting with participants on the east coast of USA, Paris, Tokyo, and Seoul. The plan is at 16:00 my time (in Stockholm), but what time is that for the others?

$ klockslag 16:00 seoul paris eastern
US/Eastern	10:00:00
Canada/Eastern	10:00:00
Europe/Paris	16:00:00
Asia/Seoul	23:00:00
Asia/Tokyo	23:00:00

You may need to disambiguate sometimes. For example:

$ klockslag 16:00 stockholm springfield paris
Oregon/Springfield	07:00:00
Illinois/Springfield	09:00:00
Missouri/Springfield	09:00:00
Tennessee/Springfield	09:00:00
Ohio/Springfield	10:00:00
Pennsylvania/Springfield	10:00:00
Virginia/Springfield	10:00:00
Massachusetts/Springfield	10:00:00
Europe/Stockholm	16:00:00
Europe/Paris	16:00:00

There are too many matching Springfields, and I wanted Paris, TX, so I add qualifiers for a better presentation:

$ klockslag 16:00 stockholm pennsylvania/springfield texas/paris
Texas/Paris	09:00:00
Pennsylvania/Springfield	10:00:00
Europe/Stockholm	16:00:00