Роман Александрович

int getDaysInMonth(DateTime date) {
  DateTime firstDayOfNextMonth = (date.month < 12)
      ? DateTime(date.year, date.month + 1, 1)
      : DateTime(date.year + 1, 1, 1);
  //проблема у тебя была тут. Ты сам у себя сьел 1 день 
  DateTime lastDayOfMonth = firstDayOfNextMonth.subtract(Duration(seconds: 1));
  
  return lastDayOfMonth.day;
}

void main() {
  DateTime date = DateTime(2024, 3, 1); // Пример: 1 марта 2024 года
  int daysInMonth = getDaysInMonth(date);
  print("Количество дней в месяце: $daysInMonth");
}

abstract class Model {
  List<String> getFields();
}

class Data extends Model {
  late final int field1;
  late final int field2;
  
  Data({required this.field1, required this.field2});

  @override
  List<String> getFields() {
    return ["field1", "field2"];
  }
}

class Table<T extends Model> {
  final List<T> dataList;
  late List<String> fieldList;
  
  Table({required this.dataList, required T instance}) {
    if (dataList.isEmpty) {
      fieldList = instance.getFields();
    } else {
      fieldList = dataList.first.getFields();
    }
  }
}

import 'package:flutter/material.dart';
import 'package:flutter_/style.dart';

class Registration extends StatefulWidget {
  @override
  State<Registration> createState() => _Registration();
}

class _Registration extends State<Registration> {

   final _nameController = TextEditingController();
    final _passwordController = TextEditingController();

  Widget button(text, linc) {
    return ElevatedButton(
      style: ElevatedButton.styleFrom(
          primary: s.buttonColor, minimumSize: Size(2500, 70)),
      onPressed: () {
        Navigator.pushNamed(context, linc);
        submitForm();
      },
      child: Text("${text}", style: TextStyle(color: Colors.white)),
    );
  }

  @override
  Widget build(BuildContext context) {
 
    return Scaffold(
        backgroundColor: s.backgroundColor,
        appBar: AppBar(
          centerTitle: true,
          backgroundColor: s.appBarColor,
          title: Text("Регистрация", style: TextStyle(color: Colors.white)),
        ),
        body: Center(
          child: Container(
              padding: EdgeInsets.symmetric(horizontal: 100, vertical: 100),
              child: Column(
                children: [
                  Icon(
                    Icons.watch_later,
                    color: s.buttonColor,
                    size: 150,
                  ),
                  SizedBox(
                    height: 50,
                  ),
                  TextFormField(
                    controller: _nameController,
                    decoration: InputDecoration(labelText: "Имя пользователя"),
                  ),
                  TextFormField(
                    controller: _passwordController,
                    decoration: InputDecoration(labelText: "Пароль"),
                  ),
                  SizedBox(
                    height: 50,
                  ),
                  button("Зарегистрироваться", "/home_page_schedule")
                ],
              )),
        ));
  }

  void submitForm() {
    print("Name ${_nameController.text}");
  }
}

Container(
color: _color,
child:Expanded(child:Center(
child:Text('123')
))
),