Code:

import 'package:flip_panel/flip_panel.dart';
import 'package:flutter/material.dart';

// ignore: must_be_immutable
class FlipDayToGo4 extends StatelessWidget {
  final bool debugMode = true;
  DateTime now = DateTime.now();
  DateTime dDay = DateTime(2018, 11, 26, 0, 0, 0);

  @override
  Widget build(BuildContext context) {
    dDay = (debugMode)
        ? DateTime(now.year, now.month + 2, now.day, now.hour, now.minute,
            now.second + 10)
        : dDay;

    Duration _duration = dDay.difference(now);

    return Scaffold(
      backgroundColor: Colors.deepOrange.shade50,
      body: Center(
        child: SizedBox(
          height: 64.0,
          child: FlipClock.reverseCountdown(
            duration: _duration,
            digitColor: Colors.white,
            backgroundColor: Colors.black87,
            digitSize: 30.0,
            borderRadius: const BorderRadius.all(Radius.circular(3.0)),
          ),
        ),
      ),
    );
  }
}