Ensure all dates returned are ISO8601

web/server.go

@@ -139,12 +139,13 @@ func (m *MockHTTPServer) handleMessages(w http.ResponseWriter, r *http.Request)
 		return &s
 	}
 
-	dateOrNil := func(s string) *time.Time {
+	dateOrNil := func(s string) *model.Date {
 		if len(s) == 0 {
 			return nil
 		}
 		t, _ := time.Parse(time.RFC3339, s)
-		return &t
+		date := model.Date(t)
+		return &date
 	}
 
 	intOrNil := func(s string) *int {
@@ -241,7 +242,7 @@ func (m *MockHTTPServer) handleSendMessage(w http.ResponseWriter, r *http.Reques
 	message := model.Message{
 		Guid:   uuid.New().String(),
 		Text:   sendMessageReq.Body,
-		Date:   time.Now(),
+		Date:   model.Date(time.Now()),
 		Sender: nil, // me
 	}