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fix(dates): use UTC parsing and display for date-only strings (#351)

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Date-only strings parsed with new Date(dateStr + 'T00:00:00') were
interpreted relative to the local timezone, causing off-by-one day
display for users west of UTC. Fixed across 16 files by parsing as
UTC ('T00:00:00Z') and displaying with timeZone: 'UTC'.
This commit is contained in:
Maurice
2026-04-03 21:18:56 +02:00
parent ba14636c1d
commit 897e1bff26
16 changed files with 43 additions and 43 deletions
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client/src/components/Trips/TripFormModal.tsx
+3 -3
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@@ -197,10 +197,10 @@ export default function TripFormModal({ isOpen, onClose, onSave, trip, onCoverUp
if (!prev.end_date || prev.end_date < value) {
next.end_date = value
} else if (prev.start_date) {
const oldStart = new Date(prev.start_date + 'T00:00:00')
const oldEnd = new Date(prev.end_date + 'T00:00:00')
const oldStart = new Date(prev.start_date + 'T00:00:00Z')
const oldEnd = new Date(prev.end_date + 'T00:00:00Z')
const duration = Math.round((oldEnd - oldStart) / 86400000)
const newEnd = new Date(value + 'T00:00:00')
const newEnd = new Date(value + 'T00:00:00Z')
newEnd.setDate(newEnd.getDate() + duration)
next.end_date = newEnd.toISOString().split('T')[0]
}