1024 weeks after 1980
I just tried adding 1024 weeks to a calendar instance set to January 6th, 1980, 00:00:00 (0:00 AM).
Calendar c = Calendar.newInstance();
c.set(1980, 01, 06, 00, 00, 00);
c.add(Calendar.WEEK_OF_YEAR, 1024);
System.out.println(c.getTime());The output is: Wed Sep 22 00:00:00 CEST 1999
Time zones is one thing (why is CEST listed and not CET, which will be listed when I add about 1450 weeks or so), but that's not the issue here. The issue is the month. According to my calendars, online calculators etc, 1024 weeks after that date and time should be on August 22nd of 1999.
Could this be a bug? Am I using the Calendar class incorrectly? How do I otherwise get the correct date (and time, if anyone can point me at hints how to consider the various leap-seconds that occur in UTC)?
drvdijk wrote:
I just tried adding 1024 weeks to a calendar instance set to January 6th, 1980, 00:00:00 (0:00 AM).
Calendar c = Calendar.newInstance();
c.set(1980, 01, 06, 00, 00, 00);
c.add(Calendar.WEEK_OF_YEAR, 1024);
System.out.println(c.getTime());The output is: Wed Sep 22 00:00:00 CEST 1999
Time zones is one thing (why is CEST listed and not CET, which will be listed when I add about 1450 weeks or so), but that's not the issue here. The issue is the month. According to my calendars, online calculators etc, 1024 weeks after that date and time should be on August 22nd of 1999.
Could this be a bug? I doubt it.
Am I using the Calendar class incorrectly? I believe so. Check your assumptions.
You entered "01" for the month, expecting that mean "January". I believe you'll get the right answer if you enter Calendar.JANUARY for the month instead.
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