A dependable clock-change routine starts with your location and the year. Check the applicable rule, identify devices that need attention, and verify important appointments after the change. Daylight saving time shifts the clock relative to daylight; the useful planning question is which local time each person or device will use.
Find the rule for your location
For U.S. locations that observe daylight saving time, the current rule begins at 2 a.m. on the second Sunday in March and ends at 2 a.m. on the first Sunday in November. The spring change jumps to 3 a.m.; the autumn change returns to 1 a.m. NIST’s rule and current-year dates are a useful starting point.
For 2026, those dates are March 8 and November 1. Hawaii, most of Arizona, and several U.S. territories remain on standard time; NIST lists the exceptions, including the Navajo Nation’s observance. Verify the actual community when traveling. Other countries can use different transition dates or keep the same offset all year.
Put the location and year beside any date you copy. Recheck the official source when making plans for a later year, especially after reports of proposed rule changes. The U.S. March/November schedule took effect in 2007; an older calendar or clock may reflect the earlier April/October pattern.
Make a short clock inventory
Walk through the places where a wrong clock could disrupt your day: bedroom, kitchen, vehicle, workstation, and any timer you depend on. Mark each as automatic, manual, or uncertain. For an unfamiliar device, find the model’s instructions before turning hands or changing settings.
- Phones and computers: check the selected location/time zone, automatic-time setting, and software updates. Compare the displayed time after the transition.
- Radio-controlled clocks: check reception and the time-zone/DST setting. A clock can receive a signal yet display the wrong local hour if configured for another region.
- Mechanical clocks and watches: follow the maker’s adjustment procedure, particularly for striking clocks and date mechanisms.
- Appliances and standalone timers: verify both the displayed time and the intended start time of programmed events.
Use the official U.S. time display as a comparison reference. If one device is an hour out, inspect its zone and seasonal setting before repeatedly correcting the hands. Record the successful setting so the next change is easier.
Check appointments across time zones
For an event involving different locations, record the full date, the organizer’s time zone, and the local time shown to each participant. A city-based time-zone selection in calendar software can follow seasonal rules. A fixed label such as UTC−5 represents a constant offset and needs separate care when an event is meant to follow local clock time.
For recurring international meetings, inspect the occurrences around both countries’ transition dates. A familiar time difference can change for part of the year. For travel, use the carrier’s current itinerary and the departure location’s local date and time.
Finish with a next-morning check
- Before the change, confirm the official date and flag manual devices.
- After the change, compare the clocks you actually use and test the next alarm or reminder setting.
- Open the next week’s shared appointments and resolve any conflicting times with the organizer.
- Update the household calendar and note any device that needed a special procedure.
The routine is complete when your reference clock, daily-use devices, and important appointments agree. Keep the device list for the next transition and check the rule again when that transition approaches.