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3 changes: 2 additions & 1 deletion src/dateutil.ts
Original file line number Diff line number Diff line change
Expand Up @@ -211,8 +211,9 @@ const dateTZtoISO8601 = function (date: Date, timeZone: string) {
return dateStr.replace(' ', 'T') + 'Z'
}

const localTimeZone = Intl.DateTimeFormat().resolvedOptions().timeZone

export const dateInTimeZone = function (date: Date, timeZone: string) {
const localTimeZone = Intl.DateTimeFormat().resolvedOptions().timeZone
// Date constructor can only reliably parse dates in ISO8601 format
const dateInLocalTZ = new Date(dateTZtoISO8601(date, localTimeZone))
const dateInTargetTZ = new Date(dateTZtoISO8601(date, timeZone ?? 'UTC'))
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