example of adapting Reagent atom based API to re-frame

datepicker.cljs

(ns re-frame.datepicker
  (:require [cljs-pikaday.reagent :as pikaday]))

(defn datepicker [k]
    (r/with-let [date         (r/atom @(rf/subscribe [:schedule/event-modal-details-value k]))
                 date-tracker (r/track! #(rf/dispatch [:schedule/update-event-modal-details k @date]))]
      [pikaday/date-selector
       {:date-atom     date
        :pikaday-attrs {:format "YYYY-MM-DD"}
        :input-attrs   {:read-only true :class "form-control"}}]
      (finally (r/dispose! date-tracker))))