In the case of the United States where a one-hour shift occurs at 02:00 local time, in spring the clock jumps forward from the last moment of 01:59 standard time to 03:00 DST and that day has 23 hours, whereas in autumn the clock jumps backward from the last moment of 01:59 DST to 01:00 standard time, repeating that hour, and that day has 25 hours. A digital display of local time does not read 02:00 exactly at the shift to summer time, but instead jumps from 01:59:59.9 forward to 03:00:00.0.
Technically, how many hours does the day the time change happens have in the spring?
23
In the case of the United States where a one-hour shift occurs at 02:00 local time, in spring the clock jumps forward from the last moment of 01:59 standard time to 03:00 DST and that day has 23 hours, whereas in autumn the clock jumps backward from the last moment of 01:59 DST to 01:00 standard time, repeating that hour, and that day has 25 hours.
In the case of the United States where a one-hour shift occurs at two:zero local time, in spring the clock jumps forward from the last moment of one:fifty-nine standard time to three:zero DST and that day has twenty-three hours, whereas in autumn the clock jumps backward from the last moment of one:fifty-nine DST to one:zero standard time, repeating that hour, and that day has twenty-five hours.
Technically, how many hours does the day the time change happens have in the spring?