Invites
Write the guest's clock
18:00 London is unambiguous if you also print 13:00 New York and 03:00 Tokyo the next morning. The columns are one instant, not three independent appointments.
Set the event in one city. The other columns are that same moment.
Invites
18:00 London is unambiguous if you also print 13:00 New York and 03:00 Tokyo the next morning. The columns are one instant, not three independent appointments.
UTC
Broadcast and aviation still name many events in UTC. The UTC page is the same scale this table uses under the hood.
Two cities
For a standing gap between two places, open a difference page. London and New York is the usual example.