Well... according to previous threads this will be the 12th year this has happened.
Basically, you use this website to determine when the clocks will go back in your location. You start a solve (physically start it, as in start the timer and turn the puzzle) a few seconds/minutes (depending on the puzzle) before the clocks go back. Your final time is then -1:00:00.000 + your final solve time, so if I did a 6x6 solve and it took me 3:34.376 seconds, then my final time would be -56:25.624.
Idk if this is still a thing but I'll be doing it because I missed it last year xD
Basically, you use this website to determine when the clocks will go back in your location. You start a solve (physically start it, as in start the timer and turn the puzzle) a few seconds/minutes (depending on the puzzle) before the clocks go back. Your final time is then -1:00:00.000 + your final solve time, so if I did a 6x6 solve and it took me 3:34.376 seconds, then my final time would be -56:25.624.
Idk if this is still a thing but I'll be doing it because I missed it last year xD