Untitled

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Countdown Timer',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: CountdownTimerScreen(),
    );
  }
}

class CountdownTimerScreen extends StatefulWidget {
  @override
  _CountdownTimerScreenState createState() => _CountdownTimerScreenState();
}

class _CountdownTimerScreenState extends State<CountdownTimerScreen> {
  late Timer _timer;
  int _remainingSeconds = 0;

  // Example nextUpdateTime in Unix milliseconds (replace with API data)
  final int nextUpdateTime = 1696267200000; // Example: 2024-10-02 12:00:00 GMT

  @override
  void initState() {
    super.initState();
    _calculateRemainingTime();
    _startTimer();
  }

  void _calculateRemainingTime() {
    // Get current time in Unix milliseconds
    int currentTime = DateTime.now().millisecondsSinceEpoch;
    
    // Calculate remaining time in seconds
    _remainingSeconds = ((nextUpdateTime - currentTime) / 1000).round();
  }

  void _startTimer() {
    _timer = Timer.periodic(Duration(seconds: 1), (timer) {
      if (_remainingSeconds > 0) {
        setState(() {
          _remainingSeconds--;
        });
      } else {
        timer.cancel();
      }
    });
  }

  @override
  void dispose() {
    _timer.cancel();
    super.dispose();
  }

  String _formatTime(int totalSeconds) {
    int hours = totalSeconds ~/ 3600;
    int minutes = (totalSeconds % 3600) ~/ 60;
    int seconds = totalSeconds % 60;
    return '${hours.toString().padLeft(2, '0')}:${minutes.toString().padLeft(2, '0')}:${seconds.toString().padLeft(2, '0')}';
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Countdown Timer'),
      ),
      body: Center(
        child: Text(
          _formatTime(_remainingSeconds),
          style: TextStyle(fontSize: 48, fontWeight: FontWeight.bold),
        ),
      ),
    );
  }
}