Jet Lag: Both Clocks

Both clocks on every line. A jet lag plan is a list of moments, and a moment has two names: what time it is at home and what time it is where you are going. This one writes both on every single line, together with both dates, so a three in the morning bedtime is pinned to the right night. Crossing the Pacific, the destination is often still on yesterday's date, and that is exactly the half other timetables drop. It goes whichever way needs fewer days. Turning your clock the short way round is not always the fast way. Going later moves further per day than going earlier, so a thirteen hour gap westward can finish in nine days while an eleven hour gap eastward takes eleven. The app compares days, not hours, and tells you on the first screen what the other direction would have cost. Times and nothing else. Bedtime, wake, when to seek light, when to avoid it, and the hour after which coffee…