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Calendar roll() not working

Judy Herilla
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Joined: Jan 05, 2001
Posts: 89
I am getting a Calendar representing today - March 1st, 2001 and rolling it back one day. I am not ending up with Feb 28th, but March 31st. This has worked in changing from January to Fevruary, but now I am having this problem. I read in the API that GregorianCalendar should resolve this issue, but I saw the same results - March 31st, 2001.
Any thoughts on how to fix this? Besides writing code to handle February?
GregorianCalendar newCal = new GregorianCalendar();
System.out.println("Todays calendar date:" + getStringFromCalendar(newCal));
//roll back the number of days between the dates passed in
newCal.roll(Calendar.DATE, -1);
System.out.println("After rollback New calendar date:" + getStringFromCalendar(newCal));

SCPJ2
Manfred Leonhardt
Ranch Hand

Joined: Jan 09, 2001
Posts: 1492
Hi Johanna,
Try to use Calendar.DAY_OF_YEAR instead. It will work every time in the roll method.
NOTE: According to API: Calendar.DATE is equivalent to Calendar.DAY_OF_MONTH which makes sense with yours results!
Regards,
Manfred.
[This message has been edited by Manfred Leonhardt (edited March 01, 2001).]
Judy Herilla
Ranch Hand

Joined: Jan 05, 2001
Posts: 89
Thanks Manfred, that did the trick!!!
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Calendar roll() not working