ICoerce produces protocol error for to-date-time

Question

I took over a Clojure project and I am experiencing an error as follows:

No implementation of method: :to-date-time of protocol: #'clj-time.coerce/ICoerce found for class: java.time.LocalDateTime

Where I am trying to assign a value in here:

{ :start-date   (time/to-string start-date) }

I am using clj-time as a dependency.

What I am confused about is especially the part where it says No implementation of method: :to-date-time of protocol even though I am using time/to-string

Is there a way I need to add that protocol?

Your help will be much more appreciated.

Answer 1

I resolved this issue. MYSQL 8 connector was returning Java LocalDateTime and clj-time was trying to convert this LocalDateTime into Joda Date time which does not exists in Java 8

I had to import those:

(:import [java.time LocalDateTime]
         [java.time.format DateTimeFormatter])

Create the formatter:

(def formatter (DateTimeFormatter/ofPattern "yyyy-MM-dd HH:mm:ss"))

And then convert to string:

(defn date-parser [{:keys [start-date expiry-date]}]
  {:start-date   (.toString (.format start-date formatter))
   :expiry-date  (.toString (.format expiry-date formatter))})

Special thanks to Steffan Westcott and Alan Thompson