解析dart/Flutter中的日期以计算日差

import 'package:flutter/material.dart';

void main() {
  DateTime date1 = DateTime(2022, 1, 1);
  DateTime date2 = DateTime(2022, 1, 10);

  Duration difference = date2.difference(date1);
  int days = difference.inDays;

  print('日期1：$date1');
  print('日期2：$date2');
  print('日期差：$days 天');
}

日期1：2022-01-01 00:00:00.000
日期2：2022-01-10 00:00:00.000
日期差：9 天

import 'package:flutter/material.dart';

void main() {
  DateTime date1 = DateTime(2022, 1, 1);
  DateTime date2 = DateTime(2022, 1, 10);

  Duration difference = date2.difference(date1);
  int days = difference.inDays;

  runApp(
    MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('日期差计算'),
        ),
        body: Center(
          child: Text(
            '日期差：$days 天',
            style: TextStyle(fontSize: 24),
          ),
        ),
      ),
    ),
  );
}