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@ -70,9 +70,14 @@ export function getModernOffsetForZoneAndDate(
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function zoneOptionForDate(zone: string, date: string) {
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const { offsetMinutes, offsetFormat: zoneOffsetAtDate } = getModernOffsetForZoneAndDate(zone, date);
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// For validity, we still need to check if the exact date/time exists in the *original* timezone (for gaps/overlaps).
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const dateForValidity = DateTime.fromISO(date, { zone });
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const valid = dateForValidity.isValid && date === dateForValidity.toFormat("yyyy-MM-dd'T'HH:mm:ss.SSS");
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// For validity, we still need to check if the exact date/time exists in the *original* timezone.
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// Use the fact that in DST gaps Luxon advances the missing time by an hour.
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// Ignore milliseconds:
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// - milliseconds are not relevant for TZ calculations
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// - browsers strip insignificant .000 making string comparison with milliseconds more fragile.
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const dateInTimezone = DateTime.fromISO(date, { zone });
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const exists = date.replace(/\.\d+/, '') === dateInTimezone.toFormat("yyyy-MM-dd'T'HH:mm:ss");
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const valid = dateInTimezone.isValid && exists;
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return {
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value: zone,
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offsetMinutes,
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