date - Adding one week via java.util.Calendar.add() fails -


i'm trying iterate in java program on weeks between 2 dates (the end date being today). first, starting date:

calendar start = calendar.getinstance(); start = data.getfirstdate(users, threads);

so far, good. start date correct , can work it. iterate:

calendar current = start; while(current.before(calendar.getinstance()) {     //     current.add(calendar.date, 7); }

well, kind of works. start @ 2002/8/23, comes 2002/8/30, 2002/9/7... until 2002/11/30. date after 2003/0/6, neither correct nor valid date!

what doing wrong? tried current.add(calendar.date, 7), current.add(calendar.week_of_year, 1), current.add(calendar.day_of_year, 7) , 2 other ways. using current.roll(calendar.date, 7) not work because stay in same month. using gregoriancalendar has no effect well.

any suggestions appreciated!

thanks julian

the month field in calendar api 0-based not 1-based. 0 stands january. don't ask me why.


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