Quick reference for Time::Format formatting codes.

$time{$format}
$time{$format, $time_value}

Numbers:
    yyyy       4-digit year
    yy         2-digit year, 00-99

    m          1- or 2-digit month, 1-12
    mm         2-digit month, 01-12
    ?m         month with leading space if < 10

    m{on}      Unambiguous month, 1-12
    mm(on}     Unambiguous month, 01-12
    ?m(on}     Unambiguous month with leading space if < 10

    d          day number, 1-31
    dd         day number, 01-31
    ?d         day with leading space if < 10

    h          hour, 0-23
    hh         hour, 00-23
    ?h         hour, 0-23 with leading space if < 10

    H          hour, 1-12
    HH         hour, 01-12
    ?H         hour, 1-12 with leading space if < 10

    m          minute, 0-59
    mm         minute, 00-59
    ?m         minute, 0-59 with leading space if < 10

    m{in}      Unambiguous minute, 1-12
    mm(in}     Unambiguous minute, 01-12
    ?m(in}     Unambiguous minute with leading space if < 10

    s          second, 0-59
    ss         second, 00-59
    ?s         second, 0-59 with leading space if < 10

    mmm        millisecond, 000-999
    uuuuuu     microsecond, 000000-999999

Names and other strings:
    Month      full month name, mixed-case (locale-specific capitalization)
    MONTH      full month name, all-uppercase
    month      full month name, all-lowercase

    Mon        3-letter month abbreviation
    MON        ditto, all-uppercase
    mon        ditto, all-lowercase

    Weekday    weekday name
    WEEKDAY    weekday name, all-uppercase
    weekday    weekday name, all-lowercase

    Day        3-letter weekday name abbreviation
    DAY        ditto, all-uppercase
    day        ditto, all-lowercase

    th         day suffix (st, nd, rd, or th)
    TH         uppercase suffix

    am         The string "am" or "pm"
    pm         ditto
    AM         The string "AM" or "PM"
    PM         ditto
    a.m.       The string "a.m." or "p.m."
    p.m.       ditto
    A.M.       The string "A.M." or "P.M."
    P.M.       ditto

    tz         time zone abbreviation