Windows users and administrators using the “(UTC-05:00) Havana” time zone need to account for Cuba’s time change: the country will remain on UTC-04:00 rather than turn clocks back on November 1, 2026. Microsoft warns that affected devices might display an incorrect local time without an update or temporary workaround. Cuba announced the change on October 27.
Microsoft plans to add support in the November 2026 security update; the notice does not yet establish that the fix is available. Until it is installed, Microsoft points to a temporary workaround in its separate “Interim guidance for Cuba DST 2026” instructions. The supplied notice does not include the workaround’s specific steps.
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