Add 6 months to DateTime in Dart

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    //final date = DateTime.parse('2025-04-29');
    final date = DateTime.parse('2025-01-01');
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: Container(
            decoration: ShapeDecoration(shape: RoundedRectangleBorder()),
            child: ListTile(
              title: Text('1. ${add183Days(date)} \n2. ${addSixMonths(date)}'),
              onTap: () {},
            ),
          ),
        ),
      ),
    );
  }
}

DateTime add183Days(DateTime date) {
  const sixMonthsInDays = 183;
  final sixMonthsAhead = DateTime(
    date.year,
    date.month,
    date.day + sixMonthsInDays,
  );
  return sixMonthsAhead;
}

DateTime addSixMonths(DateTime date) {
  final sixMonthsAhead = DateTime(date.year, date.month + 6, date.day);
  return sixMonthsAhead;
}