In some time zones, the time is put forward or back one hour in response to the start and end of daylight saving time (DST).
In the Scheduler calendar, the period when a DST transition takes place is grayed out. You are unable to add a schedule entry that starts or ends in the transition period. When a schedule entry includes the transition period, the schedule will run according to the rules below:
For the start of daylight saving:
For single and recurring schedule entries that include the transition to DST, the entries will run an hour less due to time shifting forward one hour. For example, if the schedule entry is from 1:30 to 3:30 A.M., and the time is set to switch at 2:00 A.M. (forward to 3:00 A.M.), the schedule will run from 1:30 to 2:00 A.M., and then from 3:00 A.M. to 3:30 A.M..
For recurring schedule entries set to end during the transition to DST, the entry will run from start time up to 1:59 A.M. (before the transition time). For example, if the schedule entry is set from 1:30 A.M. to 2:30 A.M., and the time is set to switch at 2:00 A.M. (forward to 3:00 A.M.), the schedule will run from 1:30 A.M. to 1:59 A.M., and on switching to DST will skip to 3:00 A.M. thus passing the end time of 2:30 A.M..
For recurring schedule entries set to start during the transition to DST, the entry will run from 3:00 A.M. to the end time. For example if the schedule entry is set from 2:30 A.M. to 4:00 A.M., the schedule will skip to 3:00 A.M. and run from 3:00 A.M. to 4:00 A.M..
For the end of daylight saving:
For single schedule entries that include the transition back to normal time from DST, the entries will run for an additional hour due to the time shifting back one hour. For example, if the schedule entry is from 1:30 to 3:30 A.M., and the time is set to switch at 3:00 A.M. (back to 2:00 A.M.), the schedule will run from 1:30 to 3:00 A.M., and then from 2:00 A.M. to 3:30 A.M..
For single schedule entries that are set to end during the transition back from DST, the entry will run for an additional period from end time to 3.00 A.M. (2.00 A.M.). For example, if the schedule entry is set from 1:30 to 2:30, the schedule will run from 1:30 A.M. to 3:00 A.M. (2:00 A.M.), then from 2:00 A.M. to 2:30 A.M. for a total of 2 hours.
For recurring schedule entries that are set to end during the transition back from DST, the entry will run before the switch back from DST. For example, if the schedule entry is set from 1:30 A.M. to 2:30 A.M., the schedule will run from 1:30 A.M. to 2:30 A.M. for one hour only.
For single and recurring schedule entries that are set to start during the transition back from DST, the entry will run after the switch from DST. For example, if the schedule entry is set from 2:30 to 3:30, the schedule will run from 2:30 A.M. to 3:30 A.M. for 1 hour only.
Note: To see resolved schedule entries and how the Scheduler is set to behave during the transition to and from DST, display the Runtime View in the Calendar.
Published June 2018