anchor.diff:  
   import 'package:cloud_firestore/cloud_firestore.dart';
   import 'package:flutter/material.dart';
  +import 'package:intl/intl.dart';
   
   import 'common.dart';
   
  
positive.code: // TODO: Determine the complement color for an image.
  // TODO: The scroll position isn't being remembered after returning from looking
  //       at a specific session.
  // TODO: Show the day and time on the session page.
  
  class SchedulePage extends StatefulWidget {
    static const String title = 'Schedule';
  
negative.code: class SessionPage extends StatelessWidget {
    static final TextStyle titleStyle =
        const TextStyle(fontSize: 20.0, fontWeight: FontWeight.w600);
    static final TextStyle dateTimeStyle =
        const TextStyle(fontWeight: FontWeight.w600, color: Colors.black54);
    static final TextStyle descStyle = const TextStyle(fontSize: 16.0);
  
    final Session session;
  