Question

I try to add one month to a date depending on weekdays. Fore example the date is the 3. Monday of September. After adding I want have the 3. Monday of October.
I tried to add one month to following date

Mon Sep 17 17:30:00 MESZ 2012

with this code:

Calendar date = Calendar.getInstance();
date.setTimeInMillis(date_in_mil);
date.add(Calendar.DAY_OF_WEEK_IN_MONTH, 3); 

But I got

Mon Oct 08 17:30:00 MESZ 2012

which is the second Monday of Oct and not the third. Has anybody an idea how this workes?

EDIT
This is the solution I used like in the answer below:

int prevDayOfWeek = date.get(Calendar.DAY_OF_WEEK);
date.add(Calendar.MONTH, 1);
date.set(Calendar.DAY_OF_WEEK, prevDayOfWeek);
date.set(Calendar.DAY_OF_WEEK_IN_MONTH, week);

wereby week is the number of the week in a month. Fore example 1 means the first, 2 the second, and so on. But week can also count backwards, fore example -1 means the last week of month.

Answer 1

If you want get 3rd monday of month, then use
set instead of add
date.set(Calendar.DAY_OF_WEEK_IN_MONTH, 3);

if you want add one month to current date, use
date.add(Calendar.MONTH, 1);

EDIT

final Calendar date = Calendar.getInstance();
date.set(2012, Calendar.SEPTEMBER, 17);

int prevDayOfWeekInMonth = date.get(Calendar.DAY_OF_WEEK_IN_MONTH);
int prevDayOfWeek = date.get(Calendar.DAY_OF_WEEK);

date.add(Calendar.MONTH, 1);
date.set(Calendar.DAY_OF_WEEK, prevDayOfWeek);
date.set(Calendar.DAY_OF_WEEK_IN_MONTH, prevDayOfWeekInMonth);