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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/Vacay/holidays.ts
+8 -8
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@@ -104,18 +104,18 @@ export function getHolidays(year: number, bundesland: string = 'NW'): Record<str
}
export function isWeekend(dateStr: string, weekendDays: number[] = [0, 6]): boolean {
const d = new Date(dateStr + 'T00:00:00')
return weekendDays.includes(d.getDay())
const d = new Date(dateStr + 'T00:00:00Z')
return weekendDays.includes(d.getUTCDay())
}
export function getWeekday(dateStr: string): string {
const d = new Date(dateStr + 'T00:00:00')
return ['So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa'][d.getDay()]
const d = new Date(dateStr + 'T00:00:00Z')
return ['So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa'][d.getUTCDay()]
}
export function getWeekdayFull(dateStr: string): string {
const d = new Date(dateStr + 'T00:00:00')
return ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'][d.getDay()]
const d = new Date(dateStr + 'T00:00:00Z')
return ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'][d.getUTCDay()]
}
export function daysInMonth(year: number, month: number): number {
@@ -123,8 +123,8 @@ export function daysInMonth(year: number, month: number): number {
}
export function formatDate(dateStr: string, locale?: string): string {
const d = new Date(dateStr + 'T00:00:00')
return d.toLocaleDateString(locale || undefined, { weekday: 'short', day: '2-digit', month: '2-digit', year: 'numeric' })
const d = new Date(dateStr + 'T00:00:00Z')
return d.toLocaleDateString(locale || undefined, { weekday: 'short', day: '2-digit', month: '2-digit', year: 'numeric', timeZone: 'UTC' })
}
export { BUNDESLAENDER }