Help improve regular expression for 24 hours format

[Jean Louis]

This regular expression shall match 24 hours format such as "12:34".

I do not like how I wrote this regular expression, is there way to
provide to `rx' function something like "[012]"?

Any other way to improve this regular expression by using rx notation
that shall match only the 24 hours format such as HH:MM where HH is
for hours and MM for minutes?

(defvar rcd-rx-time (rx (= 1 (or "00" "01" "02" "03" "04" "05" "06" "07" "08" 
"09" "10" "11" 
                                 "12" "13" "14" "15" "16" "17" "18" "19" "20" 
"21" "22" "23"))
                        ":" (= 1 (any "0" "1" "2" "3" "4" "5")) (= 1 (any 
digit)))
  "Regular expression for 24 hours format")

(string-match rcd-rx-time "23:00") ⇒ 0

--
Jean

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