I'm trying to get the number of the week for a date , In my country the week begins on Sunday so the week number of 6/5/2016 is 23 but it returning 22 because the ISO week in JAVA starts from Monday , I have used the following methods but it's not working
mCalendar = Calendar.getInstance();
int weekNum = mCalendar.get(Calendar.WEEK_OF_YEAR); //returns 22 I need 23
// I have tried the following method but it has no effect
mCalendar.setFirstDayOfWeek(Calendar.SUNDAY);
note that I can't use the Time Class I can only use Java 7
Java 8 version full answer:
public<T extends Temporal> long getWeekNumber(T tObj) {
DayOfWeek firstDayOfWeek = DayOfWeek.SUNDAY; // set your
Temporal firstDayOfThisYear = tObj.with(TemporalAdjusters.firstDayOfYear());
Temporal firstDayOfWeekInMonth = firstDayOfThisYear
.with(TemporalAdjusters.dayOfWeekInMonth(1, firstDayOfWeek));
return ChronoUnit.WEEKS.between(tObj, firstDayOfWeekInMonth);
}
The parameter can be any Temporal
type, even the Temporal
itself.
I don't know from where you are but Java has an awesome Calendar which allows the following:
Calendar calendar = Calendar.getInstance(Locale.TRADITIONAL_CHINESE);
int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR);
System.out.println("Number of week: " + weekNumber);
// produces 24
Calendar calendar = Calendar.getInstance(Locale.UK);
int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR);
System.out.println("Number of week: " + weekNumber);
// produces 22
You could use the locale constants to specify your location and i think you will get the right number of weeks.
Edit: Now I see the failure in your code. Please note that Java works from the top to the button of your code:
Calendar calendar = Calendar.getInstance();
// First set the first day of the week ...
calendar.setFirstDayOfWeek(Calendar.SUNDAY);
// ... and than you could ask the calendar for the week
int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR);
// will produce 23
System.out.println("Number of week: " + weekNumber);
I don't know where you are from. I'm french and that works perfectly this way :
Calendar mCalendar = Calendar.getInstance(Locale.FRANCE);
mCalendar.setFirstDayOfWeek(Calendar.SUNDAY);
int weekNum = mCalendar.get(Calendar.WEEK_OF_YEAR);
System.out.println(weekNum); // --> 23
I've just figured out how to change it you need to set up two things 1-first day of the week 2-the minimal day of week
setFirstDayOfWeek(Calendar.SUNDAY);
setMinimalDaysInFirstWeek(7);
this will tell the calendar to make the fist day is sunday and with 7 days minimal week
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