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fix: Calendar timezone day-shift bug (#7048) #10459

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Merged
ArtyomSavchenko merged 1 commit into from
Jan 29, 2026
Merged

fix: Calendar timezone day-shift bug (#7048) #10459

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16 changes: 11 additions & 5 deletions plugins/calendar-resources/src/components/DayCalendar.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -106,9 +106,12 @@
): CalendarItem[] => {
const result: CalendarItem[] = []
for (let day = 0; day < days; day++) {
const startDay = new Date(MILLISECONDS_IN_DAY * day + date.getTime()).setHours(0, 0, 0, 0)
const startDate = new Date(MILLISECONDS_IN_DAY * day + date.getTime()).setHours(startHour, 0, 0, 0)
const lastDate = new Date(MILLISECONDS_IN_DAY * day + date.getTime()).setHours(endHour, 0, 0, 0)
// Use setDate() for proper day arithmetic that handles timezone transitions
const targetDay = new Date(date)
targetDay.setDate(targetDay.getDate() + day)
const startDay = new Date(targetDay).setHours(0, 0, 0, 0)
const startDate = new Date(targetDay).setHours(startHour, 0, 0, 0)
const lastDate = new Date(targetDay).setHours(endHour, 0, 0, 0)
events.forEach((event) => {
const eventStart = event.allDay ? event.date + offsetTZ : event.date
const eventEnd = event.allDay ? event.dueDate + offsetTZ : event.dueDate
Expand All @@ -125,8 +128,11 @@
}
})
}
const sd = date.setHours(0, 0, 0, 0)
const ld = new Date(MILLISECONDS_IN_DAY * (days - 1) + date.getTime()).setHours(23, 59, 59, 999)
// Fix: Don't mutate the date parameter, use setDate() for proper day arithmetic
const sd = new Date(date).setHours(0, 0, 0, 0)
const lastDayDate = new Date(date)
lastDayDate.setDate(lastDayDate.getDate() + days - 1)
const ld = new Date(lastDayDate).setHours(23, 59, 59, 999)
events
.filter((ev) => ev.allDay)
.sort((a, b) => b.dueDate - b.date - (a.dueDate - a.date))
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