Interface DateTimeFormat

interface DateTimeFormat {
    format(date?: number | Date): string;
    formatRange(
        startDate: number | bigint | Date,
        endDate: number | bigint | Date,
    ): string;
    formatRangeToParts(
        startDate: number | bigint | Date,
        endDate: number | bigint | Date,
    ): DateTimeRangeFormatPart[];
    formatToParts(date?: number | Date): DateTimeFormatPart[];
    resolvedOptions(): ResolvedDateTimeFormatOptions;
}