Interface LongDateFormatSpec

interface LongDateFormatSpec {
    l?: string;
    L: string;
    ll?: string;
    LL: string;
    lll?: string;
    LLL: string;
    llll?: string;
    LLLL: string;
    lt?: string;
    LT: string;
    lts?: string;
    LTS: string;
}