Daylight saving time is a seasonal adjustment used in some locations to change local civil time relative to standard time. Its application depends on the jurisdiction and date. Devices or guide systems that use current zone rules can account for it, while fixed manual offsets may become wrong after a clock change.
A practical example
A guide that aligned correctly during one season can appear an hour out after the local clock changes if a fixed offset remains in place. The schedule source and device zone should be examined before applying another blanket correction.
A common misunderstanding
Not every country or region changes clocks, and transition dates differ. Avoid assuming that one seasonal setting is correct for every location in a regional channel group.
Related terms
Stable technical definition. Editorial approach