CODEWITHSUNDEEP
javadatecalendarjava.util.calendar
Johan Bjäreholt
Johan Bjäreholt

Reputation: 780

java.util.calendar behaving strange

So, i found the java.util.Calendar, and tried to use it for a android project i'm working on.

I do not understand at all how Calendar.DAY_OF_WEEK can return 7, when it's Thursday? And now when it's August Calendar.WEEK_OF_YEAR returns 4, which doesn't make any sense at all!

I have tried GregorianCalendar too, and it gives exactly the same results.

Tried to find any documentation about how they count, but i can't find anything. Seems like there is something very obvious, but which i just cannot find out what it is!

The code i wrote is here:

    // Get if daily or weekly
    boolean daily;
    daily = getPrefs.getBoolean("checkbox_daily", false);
    String day = "0";
    if (daily){
        switch(GregorianCalendar.DAY_OF_WEEK){
            case GregorianCalendar.MONDAY:
                Do_stuff();
                break;
            case GregorianCalendar.TUESDAY:
                Do_stuff();
                break;
            case GregorianCalendar.WEDNESDAY:
                Do_stuff();
                break;
            case GregorianCalendar.THURSDAY:
                Do_stuff();
                break;
            case GregorianCalendar.FRIDAY:
                Do_stuff();
                break;
        }
    }

Upvotes: 0

Views: 184

Answers (2)

Ahsan Mahboob Shah
Ahsan Mahboob Shah

Reputation: 4029

From java.util.Calendar docs:

Calendar defines a locale-specific seven day week using two parameters: the first day of the week and the minimal days in first week (from 1 to 7). These numbers are taken from the locale resource data when a Calendar is constructed. They may also be specified explicitly through the methods for setting their values.

When setting or getting the WEEK_OF_MONTH or WEEK_OF_YEAR fields, Calendar must determine the first week of the month or year as a reference point. The first week of a month or year is defined as the earliest seven day period beginning on getFirstDayOfWeek() and containing at least getMinimalDaysInFirstWeek() days of that month or year. Weeks numbered ..., -1, 0 precede the first week; weeks numbered 2, 3,... follow it. Note that the normalized numbering returned by get() may be different. For example, a specific Calendar subclass may designate the week before week 1 of a year as week n of the previous year.

Upvotes: 1

Jigar Joshi
Jigar Joshi

Reputation: 240996

GregorianCalendar.DAY_OF_WEEK is constant,

you need calendarInstance.get(GregorianCalendar.DAY_OF_WEEK);

Upvotes: 8

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