The United States and Canada each span 6 primary time zones. In the U.S., these are Eastern, Central, Mountain, Pacific, Alaska, and Hawaii-Aleutian. In Canada, the primary time zones are Newfoundland, Atlantic, Eastern, Central, Mountain, and Pacific. Both countries also observe Daylight Saving Time in most regions, shifting the time forward by one hour in spring and back by one hour in fall. This practice further complicates timekeeping, particularly for cross-border coordination and travel. The diverse time zones reflect the broad geographical expanse of both nations, accommodating regional differences in daylight hours and activities.