Custom Transit writer for Joda time in Clojure

Question

Clojure's transit does not support the Joda time format out of the box. How can I add write support for org.joda.time.DateTime?

Answer 1

Add this function:

(def joda-time-writer
  (transit/write-handler
   (constantly "m")
   #(-> % coerce/to-date .getTime)
   #(-> % coerce/to-date .getTime .toString)))

And use it like this:

(transit/writer out :json
                    {:handlers {org.joda.time.DateTime joda-time-writer}})