Interface DateTimeFormat

interface DateTimeFormat {
    format(date?: number | Date): string;
    format(date?: number | Date): string;
    formatToParts(date?: number | Date): DateTimeFormatPart[];
    formatToParts(date?: number | Date): DateTimeFormatPart[];
    resolvedOptions(): ResolvedDateTimeFormatOptions;
    resolvedOptions(): ResolvedDateTimeFormatOptions;
}