I am reminded of the days when Western Union Naval Observatory Clocks were in very common use throughout the United States. Getting those all set and synched for the change in time twice yearly was quite a hassle.
Typically, the 'clock man' would go around to every clock location to set the clocks manually, and it was far easier to set the clocks FORWARD one hour in the spring than it was to set the clocks FORWARD _11 hours_ in the fall (for the essence of setting the clocks _back_ one hour). Since the clocks could not be set backward more than the '12' position on the dial (and even that was ill-advised) the only solution was to set the minute hand forward 11 times to where it appeared to be one hour back
Working on an assembly line style basis, the clock man would come into the office where the clock was located, unscrew the case, pull it off, quickly zip the minute hand around the dial to where it _approximately_ had been sitting before, slap the case back on and screw it all together; he usually would be in and out of the office within two or three minutes. He only had to set the minute hand _approximately_ correct (within one or two minutes) since the next hourly mechanical setting of the clock would correct the difference as needed. If there were five or ten clocks in a single office, he had to do this five or ten times, and he would not get out for maybe fifteen minutes. In the fall, (clocks back one hour) it took longer, of course, and maybe five minutes per clock. The clock man would start this process on Friday prior to the clock change Sunday morning, work all day Friday at it for those offices which would not be open on Saturday. Then on Saturday he would work on the clocks in the offices which were open Saturday, and he would go out on Monday (day after 'clock change Sunday' as they called it) to get hopefully the few they had not gotten in the couple days before. Invariably, the fall weekend of 'clock change Sunday' took longer than the spring version; in the fall they would be at it all day Friday and all day the next week on Monday. They had a little sign on a string they would hang around the clock which said on one side of it 'this clock is adjusted for Daylight Saving Time' and the reverse side of the sign said 'clock adjusted for Standard Time'. They would hang the sign accordingly, and ask the subscriber to remove the sign on Monday or Tuesday.
The clock man was always assured of getting all the overtime work he desired on at least those two weekends of the year.
PAT