Editing Daylight saving time (section)

== Operation ==
In a region that observes daylight saving time, clocks are moved forward before the part of the year with longer evening daylight. They are moved back when the region returns to standard time. In the Northern Hemisphere, these changes usually occur during spring and autumn.

The forward transition causes an interval of local clock time to be skipped. When clocks are moved back, an interval occurs twice. The exact transition dates and clock times are determined by each jurisdiction. Changes are generally scheduled during the night to reduce disruption.

During daylight saving time, a region normally uses a [[time zone]] offset that is one hour ahead of its standard offset from [[Coordinated Universal Time]]. Sunrise and sunset therefore occur at later clock times, although their astronomical timing is unchanged.

The phrases “spring forward” and “fall back” are commonly used in North America to describe the two transitions.