What Is Daylight Saving Time?
Daylight Saving Time (DST) is the practice of advancing clocks by 1 hour during summer months to extend evening daylight. Most of the United States, Canada, and Europe observe DST. When DST is active, EST becomes EDT (UTC-4), PST becomes PDT (UTC-7), and CET becomes CEST (UTC+2). Countries like India, Japan, China, and most of Africa do NOT observe DST — their UTC offset stays fixed year-round.
When Do Clocks Change in 2025?
United States: clocks spring forward on March 9, 2025, and fall back on November 2, 2025. European Union: clocks spring forward on March 30, 2025, and fall back on October 26, 2025. This 3-week gap between US and EU transitions is critical for international scheduling — during those weeks, the time difference between New York and London is 4 hours instead of the usual 5.
How DST Affects International Meetings
The trickiest period for scheduling is during the transition gap between US and EU DST changes (March 9–30 and October 26 – November 2). During those weeks, the US–UK offset shifts by 1 hour. A standing weekly meeting at "3 PM EST / 8 PM GMT" will suddenly appear at 9 PM London time. Always verify the UTC time of recurring meetings during these transition weeks.
Which Countries Do Not Observe DST?
The following major time zones never change: India (IST, UTC+5:30), Japan (JST, UTC+9), China (CST, UTC+8), Singapore (SGT, UTC+8), UAE (GST, UTC+4), Saudi Arabia (AST, UTC+3), and most of Africa. Australia observes DST in some states but not others, and the dates are reversed (summer is December–February).
Tips for Handling DST in Remote Teams
Always schedule meetings using UTC time to avoid DST confusion. In Google Calendar, add a secondary time zone display. For recurring meetings, review them during transition weeks. Use our Time Zone Converter — it shows current local times accounting for DST automatically. Send a reminder to the team before each DST transition.