Esta entrada se publicó originalmente en Hodinkee el .
If you’re traveling from New York to Geneva (today, as I write, the time difference is six hours, with Geneva ahead), when you land at GVA, you have two choices. You can re-set the 24-hour hand to Geneva time and leave the hour and minute hand as they were, showing the time in New York. This, however, means the time display for the whole time you’re in Geneva will be a bit counter-intuitive to read – you’ll be reading the hour in Geneva off the 24-hour hand, and moreover, the date will not switch over at midnight Geneva time, but rather, six hours too late, because it will change over at midnight in New York. The other option is to re-set the local time to Geneva time, correct the date if necessary, and then re-set the 24-hour hand to the correct hour for New York. This is a bit less convenient than having a watch with an independently set local time hour hand, which you find on watches like the GMT-Master II, and it’s the reason James coined the term “caller” for such watches – they work better if you’re wondering what time it is at a place you call frequently from home. “Caller” watches can work just fine for travel, but since you have to reset the local time display and the 24-hour hand, and possibly the date, they’re a little less convenient than the next type of two-time-zone watch: what James likes to call the “flyer.”