> The idea that I don't know how many UTC seconds will pass between now and May 15, 2022 0:00:00 is absurd. Not at all. To quote Feynman: "Nature cannot be fo

> The idea that I don't know how many UTC seconds will pass between now and May 15, 2022 0:00:00 is absurd. Not at all. To quote Feynman: "Nature cannot be fooled". The earth will rotatate in a (slightly) chaotic fashion. Midnight has a definition which is based on astronomy. Thus, you need to adjust the length of a second (which is not desirable) or the number of seconds in a day.