如何计算微件在flutter中的显示时间

import 'package:flutter/material.dart';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  DateTime createTime;

  @override
  void initState() {
    super.initState();
    createTime = DateTime.now();
  }

  String getDisplayTime() {
    DateTime currentTime = DateTime.now();
    Duration difference = currentTime.difference(createTime);

    // 格式化显示时间
    String displayTime = '${difference.inHours}小时 ${difference.inMinutes.remainder(60)}分钟 ${difference.inSeconds.remainder(60)}秒';

    return displayTime;
  }

  @override
  Widget build(BuildContext context) {
    String displayTime = getDisplayTime();

    return Text('微件显示时间：$displayTime');
  }
}