ClojureScript date-time library

Too late, but for those who come by search, there is cljs-time library.

http://momentjs.com is easy to use for date arithmetic.

For example, the difference between two dates, in number of days:

(defn mom []
  (let [log (fn [& args] (.log js/console (apply str args)))
        days-ago (fn [n] (.subtract (js/moment) "days" n))]
    (log {:difference (.diff (days-ago 7) (days-ago 28) "days")})))

(mom) ==> {:difference 21}