Daylight Saving Time (DST) World Guide
Everything you need to know about when clocks change, which countries observe DST, and the upcoming clock shift dates.
Spring Forward • Fall Back
Starts on the second Sunday in March (clocks jump forward 1 hour at 2:00 AM) and ends on the first Sunday in November (clocks fall back 1 hour).
Summer Time (BST / CEST)
Starts on the last Sunday in March (1:00 AM UTC) and ends on the last Sunday in October (1:00 AM UTC).
Southern Hemisphere
Because seasons are reversed, clocks spring forward on the first Sunday in October and fall back on the first Sunday in April.
Which Countries Do NOT Observe Daylight Saving Time?
Approximately 60% of the world's countries do not practice DST. Most nations near the Equator experience virtually identical day lengths year-round, rendering daylight saving unnecessary. Major nations that do not change clocks include:
- China: Abolished DST in 1991; observes a single unified timezone (UTC+8) nationwide.
- India: Maintains India Standard Time (IST, UTC+5:30) consistently across all states without seasonal alteration.
- Japan: Discontinued DST in 1952; operates strictly on Japan Standard Time (JST, UTC+9).
- United Arab Emirates & Saudi Arabia: Year-round UTC+4 (GST) and UTC+3 (AST).
- Parts of North America: Hawaii and most of Arizona in the US, along with Saskatchewan in Canada, do not observe DST.
The Two-Week "Time Warp" Window in Spring and Autumn
Because the United States shifts to DST two weeks earlier in March than Europe, the customary 5-hour time difference between New York (EDT) and London (GMT) temporarily decreases to 4 hours. When the UK shifts to British Summer Time (BST) at the end of March, the standard 5-hour gap resumes.
Similarly, in autumn, Europe returns to standard time one week before North America, causing a temporary 1-week offset reduction. TimeAny tracks these transitions automatically so your international schedules never get blindsided.