Reject timeZone in ZonedDateTime.toLocaleString options - #64346
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[WIP] Fix illegal timeZone option in Temporal.ZonedDateTime
Reject timeZone in ZonedDateTime.toLocaleString options
Sep 19, 2026
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Temporal.ZonedDateTime#toLocaleStringalways formats in the receiver’s time zone, so a caller-suppliedtimeZoneis invalid.Changes
Temporal.ZonedDateTimeToLocaleStringOptions, omittingIntl.DateTimeFormatOptions["timeZone"].ZonedDateTime#toLocaleStringto use the new options type.optionsarg ofTemporal.ZonedDateTime.prototype.toLocaleString()currently accepts "illegal" optiontimeZone#64227