Visitors from the North

Visitors who came close to missing their flight home this afternoon, because their time-keeping devices weren't set to our time! Not a good idea, as planes take off according to the local time zone, not the zone at their destination. Fortunately someone mentioned [what they thought was] the time and I could point out that it was actually an hour later than that. So they had to leave for the airport immediately, not do whatever else they were about to suggest.