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Calculating 7 Days Prior for a known date?

Posted on 2002-03-14
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Last Modified: 2008-03-17
Basically I need to know what the date was 7 days before the date I currently know.

Initially I allow the user to set the Date:

:::
    SimpleDateFormat formatter = new SimpleDateFormat("dd-MMM-yy");
    Date currentTime1 = new Date();
    String dateString = formatter.format(currentTime1);
    jTextFieldDate.setText(dateString);
:::

ex. 14-MAR-02

Then the user needs to know what the date was 7 days ago.  I need to subtract 7 days from the date they confirm and in that format I have above.

Thanks to all that can help.

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Question by:KrAzY
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5 Comments
 
LVL 9

Expert Comment

by:yongsing
ID: 6866902
//Get current date
Calendar calendar = Calendar.getInstance();

// Get date seven days before current date
calendar.add(Calendar.DATE, -7);

SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yy");
Date currentTime1 = calendar.getTime();
String dateString = formatter.format(currentTime1);
jTextFieldDate.setText(dateString);
0
 

Accepted Solution

by:
maggari earned 50 total points
ID: 6867186
//Set date to whatever date you want to set.
//Here I am taking the current time as date
Date date = new Date();

Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
//add -7 to current time you know.
calendar.add(calendar.DATE, -7);

//Get the new time which is set to 7 days prior.
Date pdate = calendar.getTime();
0
 
LVL 11

Author Comment

by:KrAzY
ID: 6869377
I keep getting this message:

"ClearPurchasesForm.java": Error #: 300 : class getInstance not found in class java.util.Calendar at line 91, column 39


0
 

Expert Comment

by:maggari
ID: 6869509
The code I pasted works perfectly fine. Copy and paste the code I presented. Java as you know is case-sensitive, make sure you are using the right case for everything.

Check your imports. It should include java.util package.

Are you using new by any chance as in

Calendar calendar = new Calendar.getInstance();

that won't work..

I can't think of any other error. If u can paste ur code here.. i might be of some help.
0
 
LVL 11

Author Comment

by:KrAzY
ID: 6869577
Thanks... it was a minor error by me.
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