[scheduler] Timezone Issue 9: check render positioning on dst days#20900
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rita-codes merged 10 commits intomui:masterfrom Jan 14, 2026
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packages/x-scheduler-headless/src/utils/useElementPositionInCollection.ts
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flaviendelangle
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Jan 14, 2026
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Why
The Scheduler is rendered as a fixed 24h grid per day (Calendar and Timeline), but during DST transitions a day is not always 24h in real time.
When events are positioned using timestamps, DST days end up being visually shorter or longer, causing events around the DST jump to appear incorrectly sized and positioned.
What
This PR switches the timeline positioning logic from milliseconds to a stable “minutes in the grid” model.
Events are positioned using:
minutesInDay)This keeps the layout visually consistent and predictable, even on DST transition days.
Docs and examples were updated to explicitly cover a DST case (Europe/Paris).