How daylight saving time breaks your meeting schedule (and how to avoid it)
Daylight Saving Time (DST) does not change at the same moment in every country - and that misalignment is what breaks distributed team schedules.
Why the gap matters
The US moves DST on the second Sunday in March. The EU moves on the last Sunday in March. That means there is a 2-week window every spring where the US has already shifted but Europe hasn't. A London-New York call that was at 3 PM London / 10 AM New York in winter becomes 3 PM London / 11 AM New York during those two weeks, then settles at 3 PM / 10 AM again once Europe catches up.
The same thing happens in autumn: the EU ends DST on the last Sunday in October; the US ends it the first Sunday in November. Another 1-week gap where the offset is off by an hour.
Countries that don't observe DST at all - Pakistan, UAE, Saudi Arabia, China, Japan, India - add a different dimension. Their UTC offset never changes, but their relative offset to DST-observing countries shifts twice per year.
How to protect your schedule
- Use UTC-anchored recurring events. "Every Tuesday at 14:00 UTC" stays stable. "Every Tuesday at 2 PM London" shifts twice a year, and the calendar app may not handle it the way you expect across participant time zones.
- Schedule a calendar audit in late February and late October. Walk through every recurring cross-timezone meeting and verify the local times are still sensible after the upcoming DST transitions.
- Use this tool's slider the day after a DST change. Set the slider to your usual meeting UTC time and check that all selected cities still show reasonable local times.
- Warn your team 2 weeks before transitions. A Slack message ("reminder: the US shifts DST this Sunday - our Monday call moves from your 6 PM to 7 PM") prevents no-shows.
- Rely on IANA timezones, not manual offsets. If you're building tooling or automations, use IANA identifiers ("America/New_York") rather than "UTC−5" - the latter doesn't know about DST, the former does.
Countries and regions that don't observe DST (selected)
- Pakistan (PKT, UTC+5)
- India (IST, UTC+5:30)
- UAE, Saudi Arabia, Kuwait, Qatar (UTC+4 / UTC+3)
- China, Japan, South Korea, Singapore, Hong Kong
- Most of Africa
If you're scheduling between a DST-observing country and one of the above, your offset changes twice a year even though only one side is "moving."
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