Get all days of a current week?

Question

I need to get numbers of all days of a week (MON to SUN) based on which day is sent as a parameter.

For example,
I pass May 2 and I get an array [30,1,2,3,4,5,6] which is this week actually.
Or, I pass May 16 and I get an array [14,15,16,17,18,19,20].

I tried to use this code, but it return 7 days from today, which I do not want.

        //get which week of month
        Calendar now = Calendar.getInstance();
        now.set(mYear, mMonth, Integer.parseInt(extractedDay));
        int weekOfMonth = now.get(Calendar.WEEK_OF_MONTH);

        //get all days of clicked week
        SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
        Calendar calendar = Calendar.getInstance();
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        calendar.set(mYear, mMonth, Integer.parseInt(extractedDay));

        String[] days = new String[7];
        for (int i = 0; i < 7; i++)
        {
            days[i] = format.format(calendar.getTime());
            calendar.add(Calendar.DAY_OF_MONTH, 1);
        }

But this is not what I need. I need to pass today's day (THU) and to get dates of this week of May - Mon, Apr 30 to Sun, May 6.

EDIT

I realized that I have a code which detects which week of a month it is. Is there a way to use this data and to set a date for Monday? For example, I pass May 16 and then I detect that it's 3rd week of May, and the I set the variable firstDayOfWeek (a new variable) to May 14.

Answer 1

You have first to subtract the weekday of the day you choose, in order to start from the first day of week. Try the following code:

public static void main(String[] args){
    Calendar now = Calendar.getInstance();

    SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");

    String[] days = new String[7];
    int delta = -now.get(GregorianCalendar.DAY_OF_WEEK) + 2; //add 2 if your week start on monday
    now.add(Calendar.DAY_OF_MONTH, delta );
    for (int i = 0; i < 7; i++)
    {
        days[i] = format.format(now.getTime());
        now.add(Calendar.DAY_OF_MONTH, 1);
    }
    System.out.println(Arrays.toString(days));

}

Today, it output:

[04/30/2012, 05/01/2012, 05/02/2012, 05/03/2012, 05/04/2012, 05/05/2012, 05/06/2012]

Answer 2

Your question has already been answered, but I'd like to add a bit. Your code is problematic in two ways:

1. It uses various data types for the initial date ( mYear is int and exactDay is String ?).
2. It mixes parsing, formatting and generation of the result.

That makes it hard for you to test the code!

Therefore, I propose a different approach:

public class DaysOfCurrentWeek {
    public static void main(String[] args) {
        Date refDate = new Date();

        Date[] days = getDaysOfWeek(refDate, Calendar.getInstance().getFirstDayOfWeek());

        for (Date day : days) {
            System.out.println(day);
        }
    }

    private static Date[] getDaysOfWeek(Date refDate, int firstDayOfWeek) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(refDate);
        calendar.set(Calendar.DAY_OF_WEEK, firstDayOfWeek);
        Date[] daysOfWeek = new Date[7];
        for (int i = 0; i < 7; i++) {
            daysOfWeek[i] = calendar.getTime();
            calendar.add(Calendar.DAY_OF_MONTH, 1);
        }
        return daysOfWeek;
    }
}

The code works like this:

1. Create a reference date (in this example just by using new Date() ).
2. Call getDaysOfWeek() to do the "dirty job". By passing firstDayOfWeek you are free to choose MONDAY or SUNDAY as start of the week. In this example, I just use the default of the calendar.
3. Return the result - unformatted, and as Date . This way you can let the calling code decide what to do - print it or do some further calculations.

Now you can simply test the getDaysOfWeek() method without worrying about formatting or how the reference date has been created.

Answer 3

You will need to use this line of code somewhere in you current code:

calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);

it should be at least before the for-loop.

Answer 4

you need to set the day after you set the date

calendar.set(mYear, mMonth, Integer.parseInt(extractedDay)); calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);