#dateformatter

Also

https://nshipster.com/formatter/

    x           number

    xx          two digit number

    xxx         abbreviated name

    xxxx        full name

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    a           AM/PM

    A           millisecond of day

    c           day of week (c,cc,ccc,cccc)

    d           day of month

    e           day of week (e,EEE,EEEE)

    F           week of month

    g           julian day (since 1/1/4713 BC)

    G           era designator (G=GGG,GGGG)

    h           hour (1-12, zero padded)

    H           hour (0-23, zero padded)

    L           month of year (L,LL,LLL,LLLL)

    m           minute of hour (0-59, zero padded)

    M           month of year (M,MM,MMM,MMMM)

    Q           quarter of year (Q,QQ,QQQ,QQQQ)

    s           seconds of minute (0-59, zero padded)

    S           fraction of second

    u           zero padded year

    v           general timezone (v=vvv,vvvv)

    w           week of year (0-53, zero padded)

    y           year (y,yy,yyyy)

    z           specific timezone (z=zzz,zzzz)

    Z           timezone offset +0000

    sql         y-M-d H:m:s

    rss         [E, ]d MMM y[y] H:m:s Z|z[zzz]