WebIntlIntl.DateTimeFormatOptionsinterface Intl.DateTimeFormatOptionsunstableProperties #optional#dayPeriod: "narrow" | "short" | "long"optional#dateStyle: "full" | "long" | "medium" | "short"optional#timeStyle: "full" | "long" | "medium" | "short"
interface Intl.DateTimeFormatOptionsunstableProperties #optional#dayPeriod: "narrow" | "short" | "long"optional#dateStyle: "full" | "long" | "medium" | "short"optional#timeStyle: "full" | "long" | "medium" | "short"