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