Flutter get number of days in month

To get the number of days in a month using Flutter, you can use the `DateTime` class and its methods.
Here’s an example:

  
    import 'package:flutter/material.dart';
    import 'package:intl/intl.dart';
    
    void main() {
      runApp(MyApp());
    }
    
    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return MaterialApp(
          home: Scaffold(
            appBar: AppBar(
              title: Text('Number of Days in a Month'),
            ),
            body: Center(
              child: RaisedButton(
                onPressed: () {
                  int numberOfDays = getNumberOfDaysInMonth(2022, 2);
                  String monthName = DateFormat('MMMM').format(DateTime(2022, 2, 1));
                  String year = "2022";
                  showDialog(
                    context: context,
                    builder: (BuildContext context) {
                      return AlertDialog(
                        title: Text('Number of Days in $monthName $year'),
                        content: Text('$numberOfDays'),
                        actions: [
                          FlatButton(
                            child: Text('Close'),
                            onPressed: () {
                              Navigator.of(context).pop();
                            },
                          ),
                        ],
                      );
                    },
                  );
                },
                child: Text('Get Number of Days'),
              ),
            ),
          ),
        );
      }
      
      int getNumberOfDaysInMonth(int year, int month) {
        if (month == 2) {
          if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
            return 29; // leap year
          } else {
            return 28; // non-leap year
          }
        } else if (month == 4 || month == 6 || month == 9 || month == 11) {
          return 30; // months with 30 days
        } else {
          return 31; // months with 31 days
        }
      }
    }
  
  

In this example, a `RaisedButton` is used to trigger the calculation of the number of days in the month of February 2022.
The `getNumberOfDaysInMonth()` function takes the year and month as parameters and returns the corresponding number of days.
The result is then displayed in an `AlertDialog`.

The logic for calculating the number of days in a month is as follows:

• If the month is February, we need to check if it’s a leap year. If it is, the month has 29 days, otherwise it has 28 days.
• If the month is April, June, September, or November, it has 30 days.
• For all other months, we assume they have 31 days.

You can modify the code to calculate the number of days in any month and year by passing different values to the `getNumberOfDaysInMonth()` function.
For example, calling `getNumberOfDaysInMonth(2023, 12)` would return the number of days in December 2023.