On Sunday, November 5, 2017, most of North America set clocks back one hour, marking the end of daylight saving time for that year. This annual shift moved daylight from the evening into earlier morning hours, affecting travel, commerce, and daily routines across multiple time zones.
The table below summarizes key details of the 2017 fall time change for users in the United States and neighboring regions, including exact change dates, local time behavior, and impacts on scheduling.
| Region | Date in 2017 | Local Time Behavior | Common Impact |
|---|---|---|---|
| United States (most states) | Sunday, November 5 | 2:00 AM local daylight time → 1:00 AM local standard time | Extra hour of sleep, earlier morning light |
| Canada (most provinces) | Sunday, November 5 | 2:00 AM local daylight time → 1:00 AM local standard time | Synchronized with U.S. for cross-border coordination |
| Arizona (most areas) | No change | Remains on Mountain Standard Time year-round | No clock adjustment required |
| Hawaii | No change | Remains on Hawaii–Aleutian Standard Time | No clock adjustment required |
Understanding The Fall Time Change Mechanics
The fall time change occurs on the first Sunday in November, following rules established by the Energy Policy Act of 2005. Clocks are set backward by one hour at 2:00 AM local daylight time, effectively repeating the hour from 1:00 AM to 1:59 AM in standard time.
For computer systems, mobile devices, and networked infrastructure, this shift is typically handled by automatic time zone updates. Devices using network time protocol resynchronize with global time servers, reducing the risk of scheduling errors during the repeated hour.
Impact On Transportation And Daily Schedules
Public transit and airline operations adjust timetables to reflect standard time, and many commuters notice darker morning conditions. Shift workers and parents coordinating school drop-offs may need to adapt routines to align with earlier daylight and changing bus or train schedules.
Businesses that operate across time zones review meeting and call schedules to avoid confusion, particularly when overlapping work hours shift after the change. Digital calendar tools and automated reminders help reduce missed appointments during this transition period.
Health And Sleep Considerations
The extra hour of sleep can support better short-term alertness, but some people experience temporary disruption to established sleep routines. Gradual adjustments to bedtime in the days before the change can ease the transition for sensitive individuals.
Healthcare providers sometimes note minor fluctuations in mood and energy levels following the fall shift, especially among older adults. Maintaining consistent sleep hygiene and morning light exposure supports smoother adaptation to the new schedule.
Historical Context And Regional Observance
Since 2007, the Uniform Time Act has standardized the fall time change to the first Sunday in November across most U.S. jurisdictions. Earlier in U.S. history, local and state variations were common, leading to complex scheduling challenges for transportation and broadcasting.
Regions such as Arizona and Hawaii opt out of daylight saving time altogether, maintaining stable local time year-round. This selective observance highlights how regional preferences and geographic factors influence time policy across the country.
Key Takeaways For 2017 Fall Time Change
- November 5, 2017 marks the official end of daylight saving time in most of the U.S.
- Regions like Arizona and Hawaii do not observe the change and keep standard time year-round.
- Electronic devices usually update automatically, but manual checks reduce scheduling risks.
- Plan commutes and meetings around the shifted hour to avoid conflicts in the first week.
- Support healthy sleep with gradual bedtime adjustments and morning light exposure.
FAQ
Reader questions
Does the fall time change in 2017 affect all U.S. states the same way?
No, Arizona and most of Hawaii do not change their clocks in November 2017 and remain on standard time throughout the year.
What local time does the change occur on Sunday, November 5?
Clocks are set back from 2:00 AM daylight time to 1:00 AM standard time, repeating the 1:00–1:59 AM hour.
Will my phone and computer update automatically for the time change?
Yes, devices connected to time servers or configured for automatic time zone updates typically adjust without user intervention.
How can I reduce sleep disruption after the clocks move back?
Maintain a consistent bedtime, expose yourself to morning light, and avoid large schedule shifts in the day or two surrounding the change.