exception handling example

my-date-time.clj

(ns my-ns
  (:use [clj-time.core :only [date-time]]))

(defn my-date-time
  "same as clj-time.core date-time but returns nil on improper input"
  [& args]
  (try
    (apply date-time (map #(Integer/parseInt %) args))
    (catch RuntimeException e nil)))

; returns a clj-time.core date-time
(println (my-date-time "2011" "01" "01"))

; returns nil
(println (my-date-time "2011" "asdf" "01"))