Implement JSON.Encoder for Calendar types (#14061)

Author: josevalim

lib/elixir/lib/json.ex

@@ -150,6 +150,12 @@ defimpl JSON.Encoder, for: Map do
  end
 end
 
+defimpl JSON.Encoder, for: [Date, Time, NaiveDateTime, DateTime] do
+ def encode(value, _encoder) do
+ [?", @for.to_iso8601(value), ?"]
+ end
+end
+
 defmodule JSON.DecodeError do
  @moduledoc """
  The exception raised by `JSON.decode!/1`.

lib/elixir/test/elixir/json_test.exs

@@ -46,6 +46,13 @@ defmodule JSONTest do
  assert JSON.encode!(%Token{value: :example}) == "[\"example\"]"
  assert JSON.encode!(%Token{value: "hello\0world"}) == "[\"hello\\u0000world\"]"
  end
+
+ test "calendar" do
+ assert JSON.encode!(~D[2010-04-17]) == "\"2010-04-17\""
+ assert JSON.encode!(~T[14:00:00.123]) == "\"14:00:00.123\""
+ assert JSON.encode!(~N[2010-04-17 14:00:00.123]) == "\"2010-04-17T14:00:00.123\""
+ assert JSON.encode!(~U[2010-04-17 14:00:00.123Z]) == "\"2010-04-17T14:00:00.123Z\""
+ end
  end
 
  describe "JSON.Encoder" do