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fix(web): fix timezone dropdown for timestamps lacking milliseconds (#23615)

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Fix timezone selector for timestamps without milliseconds
This commit is contained in:
Sergey Katsubo
2025-11-05 17:03:55 +03:00
committed by GitHub
parent aa69d89b9f
commit 3cc9dd126c
1 changed files with 8 additions and 3 deletions
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11
web/src/lib/modals/timezone-utils.ts
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@@ -70,9 +70,14 @@ export function getModernOffsetForZoneAndDate(
function zoneOptionForDate(zone: string, date: string) {
const { offsetMinutes, offsetFormat: zoneOffsetAtDate } = getModernOffsetForZoneAndDate(zone, date);
// For validity, we still need to check if the exact date/time exists in the *original* timezone (for gaps/overlaps).
const dateForValidity = DateTime.fromISO(date, { zone });
const valid = dateForValidity.isValid && date === dateForValidity.toFormat("yyyy-MM-dd'T'HH:mm:ss.SSS");
// For validity, we still need to check if the exact date/time exists in the *original* timezone.
// Use the fact that in DST gaps Luxon advances the missing time by an hour.
// Ignore milliseconds:
// - milliseconds are not relevant for TZ calculations
// - browsers strip insignificant .000 making string comparison with milliseconds more fragile.
const dateInTimezone = DateTime.fromISO(date, { zone });
const exists = date.replace(/\.\d+/, '') === dateInTimezone.toFormat("yyyy-MM-dd'T'HH:mm:ss");
const valid = dateInTimezone.isValid && exists;
return {
value: zone,
offsetMinutes,