CODEWITHSUNDEEP
flutterdatedatetimedart
DEFL
DEFL

Reputation: 1052

Flutter get Weekend and Month

I need to get the Date for the weekend in Flutter(Only Friday and Saturday) and the Date for the first day and the last day of the month

This is the approach I tried for the weekend but it doesn´t work:

      var dateuntilfriday = DateTime.now();

      getFriday() async {
        if (dateuntilfriday.weekday == DateTime.friday) {
          dateuntilfriday.add(Duration(days: 0));
          print("1 Executed");
        } else if (dateuntilfriday.weekday == DateTime.saturday) {
          dateuntilfriday.subtract(Duration(days: 1));
          print("2 Executed");
        } else if (dateuntilfriday.weekday == DateTime.sunday) {
          dateuntilfriday.subtract(Duration(days: 2));
          print("3 Executed");
        } else if (dateuntilfriday.weekday == DateTime.monday) {
          dateuntilfriday.add(Duration(days: 4));
          print("4 Executed");
        } else if (dateuntilfriday.weekday == DateTime.tuesday) {
          dateuntilfriday.add(Duration(days: 3));
          print("5 Executed");
        } else if (dateuntilfriday.weekday == DateTime.wednesday) {
          dateuntilfriday.add(Duration(days: 2));
          print("6 Executed");
        } else if (dateuntilfriday.weekday == DateTime.thursday) {
          dateuntilfriday.add(Duration(days: 1));
          print("7 Executed");
        } else {
          print(
              "and Error Occurent while getting the date for the next or last friday");
        }

        print(dateuntilfriday);
      }

Upvotes: 1

Views: 2182

Answers (1)

Thierry
Thierry

Reputation: 8383

I think this achieves what you are looking for:

DateTime weekdayOf(DateTime time, int weekday) => time.add(Duration(days: weekday - time.weekday));
DateTime fridayOf(DateTime time) => weekdayOf(time, 5);
DateTime saturdayOf(DateTime time) => weekdayOf(time, 6);
DateTime firstMonthDayOf(DateTime time) => DateTime(time.year, time.month, 1);
DateTime lastMonthDayOf(DateTime time) => DateTime(time.year, time.month + 1, 0);

I used a trick for the last day of the month. Day [0] of next month is the last day of this month.

enter image description here

Full source code

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

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      home: HomePage(),
    ),
  );
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final now = DateTime.now();
    final df = DateFormat.yMMMMEEEEd();
    return Scaffold(
      body: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text('Today is ${df.format(now)}'),
          const SizedBox(height: 16.0),
          Text('Friday is ${df.format(fridayOf(now))}'),
          const SizedBox(height: 16.0),
          Text('Saturday is ${df.format(saturdayOf(now))}'),
          const SizedBox(height: 16.0),
          Text('First day of month is ${df.format(firstMonthDayOf(now))}'),
          const SizedBox(height: 16.0),
          Text('Last day of month is ${df.format(lastMonthDayOf(now))}'),
        ],
      ),
    );
  }
}

DateTime weekdayOf(DateTime time, int weekday) => time.add(Duration(days: weekday - time.weekday));
DateTime fridayOf(DateTime time) => weekdayOf(time, 5);
DateTime saturdayOf(DateTime time) => weekdayOf(time, 6);
DateTime firstMonthDayOf(DateTime time) => DateTime(time.year, time.month, 1);
DateTime lastMonthDayOf(DateTime time) => DateTime(time.year, time.month + 1, 0);

Upvotes: 6

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