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Bug: tz events store wall-clock LOCAL times but export stamped them with a Z (UTC) suffix, so a London 18:00 event falsely read as 18:00 UTC. ev-ical-conv now converts a tz event's DTSTART/UNTIL/EXDATE/RDATE local->UTC before formatting (London summer 18:00 -> 170000Z; Paris -> 160000Z); non-tz events unchanged. Caveat: UTC RRULE drifts from wall-clock-stable tz recurrence across a DST boundary (VTIMEZONE deferred). 366/366 green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>