Cuba’s clock change was cancelled. Windows may still expect it
The Havana zone is staying at UTC−04:00. An outdated seasonal rule can shift meetings even when the underlying clock is correct.
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Timekeeping
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Canada’s clock changes can move your Google Calendar meeting—even abroad
Google warns that updates may not reach every product in time. Calendar time zones and a device’s displayed clock need separate attention.
Leap seconds end in May 2027: what continuous UTC changes
The new international rule separates civil time from tiny corrections for Earth’s rotation. Its one-hour tolerance is not an instruction to move the clocks.