CODEWITHSUNDEEP
flutterdart
Mohammed Niyaz
Mohammed Niyaz

Reputation: 179

how to split hours by 30 mins in flutter?

final response = await apiResponseMaker(result, ModelType.working_hour);
      if (response['success']) {
        List<WorkingHourModel> workingHours = response['hours'];

        int startTime = int.parse(workingHours[0].startTime.split(':')[0]);
        int endTime = int.parse(workingHours[0].endTime.split(':')[0]);
        int hoursLeft = endTime - startTime + 1;

        print('Hours-------- $hoursLeft');
        List<String> hours = List.generate(hoursLeft * 2, (i) => '${endTime(i/2).truncate()}:${i%2 == 1 ? '00' : '30'}').reversed.toList();

        hours.forEach(print);
        print('Hours-------- $hours');
        return {
          'success': true,
          'hours': hours,
        };
      }
      return response;
}

enter image description here

the response i get is:

{"success":true,"working_hours":[{"day":"Monday","start_time":"09:00","end_time":"17:00","is_holiday":false}]}

This gives list of hours

[9:00, 9:30, 10:00, 10:30, 11:00, 11:30, 12:00, 12:30, 13:00, 13:30, 14:00, 14:30, 15:00, 15:30, 16:00, 16:30, 17:00, 17:30]

The end hour is 17:00. but its showing extra adding 17:30. This happens every time when an hour is ending with __:00.

For example: If response is

{"day":"Monday","start_time":"11:00","end_time":"15:00","is_holiday":false}

the hours will be:

[11:00, 11:30, 12:00, 12:30, 13:00, 13:30, 14:00, 14:30, 15:00, 15:30]

Upvotes: 0

Views: 1376

Answers (3)

Muhammad Nashat
Muhammad Nashat

Reputation: 5

you can use this code

List<String> generateTimeIntervals(String startTime, String endTime) {
  final start = DateTime.parse("2022-02-22 $startTime");
  final end = DateTime.parse("2022-02-22 $endTime");
  final result = <String>[];
  while (start.isBefore(end)) {
    result.add(formatTime(start));
    start = start.add(Duration(minutes: 30));
  }
  return result;
}

String formatTime(DateTime time) {
  return "${time.hour.toString().padLeft(2, '0')}:${time.minute.toString().padLeft(2, '0')}";
}

Upvotes: 0

Swaminathan V
Swaminathan V

Reputation: 4781

You can use TimeOfDay class from Flutter and Duration API to achieve the expected result. Here is the sample snippet.

Logic of splitting slots

Iterable<TimeOfDay> getTimeSlots(TimeOfDay startTime, TimeOfDay endTime, Duration interval) sync* {
  var hour = startTime.hour;
  var minute = startTime.minute;

  do {
    yield TimeOfDay(hour: hour, minute: minute);
    minute += interval.inMinutes;
    while (minute >= 60) {
      minute -= 60;
      hour++;
    }
  } while (hour < endTime.hour || (hour == endTime.hour && minute <= endTime.minute));
}

Use them like below

final startTime = TimeOfDay(hour: 9, minute: 0);
final endTime = TimeOfDay(hour: 22, minute: 0);
final interval = Duration(minutes: 30);

final times = getTimeSlots(startTime, endTime, interval)
      .toList();
print(times);

End result will be the array of slots in TimeOfDay format. You can format it either in the getTimeSlots method or after receiving the array.

Upvotes: 0

snaksa
snaksa

Reputation: 577

Looks like your logic to generate the list is not correct. You can try the following:

List<String> hours = List.generate(hoursLeft * 2 - 1, (i) => '${startTime + (i/2).floor()}:${i%2 == 0 ? '00' : '30'}').toList();

First you need to generate N records where N = hoursLeft * 2 - 1. The minus one is because otherwise you will generate one more record which is 17:30 because 18 - 9 = 9 and you will generate 9 * 2 = 18 records but you need only 17 to reach 17:00. Also in your code you use endTime(i/2) which should throw an error since endTime is not a method and can't be executed that way.

Upvotes: 1

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