如何设置CupertinoDatePicker小部件在flutter中的最短时间？

import 'package:flutter/cupertino.dart';

class MyDatePicker extends StatefulWidget {
  @override
  _MyDatePickerState createState() => _MyDatePickerState();
}

class _MyDatePickerState extends State<MyDatePicker> {
  DateTime _selectedDate = DateTime.now();

  @override
  Widget build(BuildContext context) {
    return CupertinoDatePicker(
      mode: CupertinoDatePickerMode.date,
      initialDateTime: _selectedDate,
      minimumDate: DateTime.now(), // 设置最短时间为当前时间
      onDateTimeChanged: (DateTime newDate) {
        setState(() {
          _selectedDate = newDate;
        });
      },
    );
  }
}