Summer Time Begins 2025. In 2025, dst begins on 9 march 2025 at 02:00 am and ends on 2 november 2025 at 03:00 am. Summer 2025 starts on friday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis having reached its furthest tilt and begins to change directiion back.

Daylight saving time (dst, also known as summer time) is the practice of advancing clocks by one hour (relative to the standard time) during summer months to make better use of daylight in the evening. Throughout the united states, people in many states prepare and reset their time accordingly.