Expose sessionStart and sessionEnd on ongoing sessions

lib/easee/session.rb

@@ -7,5 +7,17 @@ def initialize(data)
     def id = @data.fetch(:sessionId)
 
     def energy = @data.fetch(:sessionEnergy).to_f
+
+    def session_start = parse_time(:sessionStart)
+    def session_end = parse_time(:sessionEnd)
+
+    private
+
+    def parse_time(key)
+      value = @data[key]
+      return if value.nil?
+
+      Time.zone.parse(value)
+    end
   end
 end

spec/easee/session_spec.rb

@@ -0,0 +1,31 @@
+RSpec.describe Easee::Session do
+  it "exposes the session fields" do
+    session = described_class.new(
+      "sessionId" => 12345,
+      "sessionEnergy" => 3.42,
+      "sessionStart" => "2026-01-05T10:00:00Z",
+      "sessionEnd" => "2026-01-05T11:30:00Z",
+    )
+
+    expect(session).to have_attributes(
+      id: 12345,
+      energy: 3.42,
+      session_start: Time.zone.parse("2026-01-05T10:00:00Z"),
+      session_end: Time.zone.parse("2026-01-05T11:30:00Z"),
+    )
+  end
+
+  it "returns nil for session_start and session_end when the fields are missing or null" do
+    session = described_class.new(
+      "sessionId" => 12345,
+      "sessionEnergy" => 0.0,
+      "sessionStart" => nil,
+      "sessionEnd" => nil,
+    )
+
+    expect(session).to have_attributes(
+      session_start: nil,
+      session_end: nil,
+    )
+  end
+end