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How Daylight Saving Time Affects International Meetings
If you schedule recurring calls with people in other countries, you've probably had a meeting mysteriously move by an hour. The cause is almost always daylight saving time — and the fact that different countries change their clocks on different dates.
Not Everyone Changes Clocks at the Same Time
The United States and Canada typically move clocks forward in early March and back in early November. The European Union shifts on the last Sunday of March and the last Sunday of October — usually a few weeks apart from the US transitions. Countries like Pakistan, the UAE, China, and India don't observe daylight saving time at all, so their offset from Europe or North America changes twice a year even though their own clocks never move.
Example: In early March, after the US has sprung forward but before the EU has, the gap between New York and Berlin temporarily shrinks from 6 hours to 5 hours — for about two to three weeks.
Why Recurring Meetings Break
A meeting scheduled for "9:00 AM Eastern Time, every Tuesday" will automatically track Eastern Time's own transitions, but its equivalent local time in Karachi or Dubai will shift by an hour during the mismatched transition window, because those zones never move at all.
How to Protect Your Meetings
- Schedule meetings by anchoring to the time zone that matters most to the largest group of attendees, and let calendar software convert the rest.
- Double-check meeting times in the two weeks around early March, late March, and early November, when transition dates mismatch.
- Use a live comparison tool (like the one on this site) rather than a static "add 5 hours" rule, since fixed offsets break across DST boundaries.
- Communicate the UTC time explicitly in meeting invites for teams spanning DST and non-DST countries.
Frequently Asked Questions
Frequently Asked Questions
Why did my meeting time change even though I didn't edit it?
Your calendar app recalculated the local time in one or more time zones after a daylight-saving transition. This is expected — the meeting is still at the same absolute (UTC) moment.
Frequently Asked Questions
Which countries never observe daylight saving time?
Most of Asia, Africa, and countries near the equator don't observe DST, including Pakistan, India, China, and the UAE. The effective time difference with DST-observing countries changes twice a year as a result.