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The clock is moved forward during the change from standard to summer (daylight saving) time (in Germany this takes place from 2 o'clock in the morning, standard time, to 3 o'clock). Start times that are scheduled in this period are 'postponed' until the start of summer time (3 o'clock in the morning in Germany, summer time). This ensures that all runs planned for the 'missing' hour are carried out. Repeat intervals, that are scheduled for the missing hour are generally only carried out once.
Change
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from summer time to standard time
No particular measures are required during the change from summer to standard time. Even when 'putting back the clock' causes the hour to be 'repeated' (when seen from the standpoint of local time), JobScheduler's internal use of UTC ensures a continual flow of operations (see the examples later in this FAQ) and ensures that unwanted repetition of planned jobs and orders is avoided.
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Local time Helsinki UTC time Time difference in h Remarks ---------------------- ---------------------- ---------------------- ---------------------- 2012-03-25 02:30 2012-03-25 00:30 2 Still standard time 2012-03-25 03:00 2012-03-25 01:00 2 Start of summer time, shift from 3 to 4 o'clock 2012-03-25 03:30 2012-03-25 01:00 2,5 This local time does not exist, the hour is 'missing'. Start times are postponed until 4 o'clock 2012-03-25 04:00 2012-03-25 01:00 3 2012-03-25 04:30 2012-03-25 01:30 3 |
Change from summer time to standard time
In contrast to Germany, the changeover from summer to standard time takes place at 4 o'clock.
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