Needed logic for java date

[Kartik Tal]

Hi All,

Am having a calendar control for my page where am getting date in dd/mm/yyyy format which is taken as a string.
And am converting that string to DateFormat and then to Calendar. Below is the code which I have used

String args="26/8/2009";
DateFormat df = new SimpleDateFormat("dd/MM/yyyy"); 
Calendar date = Calendar.getInstance();

Date today = df.parse(args);
date.setTime(today);

1) I need a logic in such a way that if I select a date it has to check the day and if its not monday it has to get the Monday of that particular week.
For example like if he selected "26/8/2009" the day will be Wednesday, I need a logic where it gives "24/8/2009" as it is monday of that particular week.
2) And next is after getting "24/8/2009" , I need one more logic like it has to get date of next four weeks that is "21/9/2009"

[Sebastian Janisch]

How about

Calendar cal = Calendar.getInstance();

cal.set (Calendar.DAY_OF_WEEK, Calendar.MONDAY);

[Neelesh A Korade]

Might be trickier than this.

If the initial date is a SUNDAY, for example "30/8/2009", this will return 31/8/2009. Not sure if that is what is expected. If 24/8/2009 is the desired result, a bit complicated logic can be written.

[Sebastian Janisch]

This is because the US week starts on sunday.
You could change this by passing a locale with a country that's week starts on Monday, such as Germany.

Calendar cal = Calendar.getInstance(new Locale("DE"));

[Neelesh Korade]

Yes, you are right. Didn't realize this earlier. Thank you.

[Kartik Tal]

Thanks a lot that helped me a lot...