CODEWITHSUNDEEP
javadatecalendarlocale
jnemecz
jnemecz

Reputation: 3608

What is purpose of locale setting in Java java.util.Calendar?

I am obtaining information (such as number of a day in week, month, year etc) about particular date in Java via java.util.Calendar. Is there some reason to set locale for calendar object in my situation? I am asking beacuse:

System.out.println(cal.get(Calendar.DAY_OF_WEEK));

returns for today (Sunday) always number 1 but in our locale (cs_CZ) it should be 7.

Locale locale = new Locale("cs", "CZ");
TimeZone tz = TimeZone.getTimeZone("Europe/Prague");

Calendar cal = GregorianCalendar.getInstance(tz, locale);
cal.setTime(new Date());

// returns => 1 (but I expected 7)
System.out.println(cal.get(Calendar.DAY_OF_WEEK)); 
// returns => 3 - it's OK
System.out.println(cal.get(Calendar.DAY_OF_MONTH));

EDIT: I can hadle with 1 for Sunday, but I must be sure this is unchanging behaviour regardless to used Locale or TimeZone.

Upvotes: 4

Views: 17634

Answers (2)

jnemecz
jnemecz

Reputation: 3608

Finally I used Joda Time library:

DateTime dt = new DateTime(new Date());
int dayOfWeek = dt.getDayOfWeek();

and it returns 7 for today (Sunday).

Upvotes: -7

shuangwhywhy
shuangwhywhy

Reputation: 5625

Locale do will affect the first day of week. However, the day values are constants, SUNDAY is always 1. You can check this link. The get() method just returns the correct field value (If it returns 7 then it's wrong -- 7 is SATURDAY, not the current day).

But you can call getFirstDayOfWeek() and it returns 2 (MONDAY). I think this is what you need. You can take use of these two methods to reach your goal.

System.out.println((cal.get(Calendar.DAY_OF_WEEK) - cal.getFirstDayOfWeek() + 7) % 7 + 1);

The above statements returns 7.

Upvotes: 10

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