FULL PRODUCT VERSION :
java version "1.6.0_43"
Java(TM) SE Runtime Environment (build 1.6.0_43-b01)
Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux localhost.localdomain 3.4.9-2.fc16.x86_64 #1 SMP Thu Aug 23 17:51:29 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
using the DateFormat.parse method to parse dates referring to the same day as the source in the different formats returns a two different Dates
for SimpleDateFormart("MMddyy").parse("082713")
expected <Tue Aug 06 00:00:00 CAT 2013> but was:<Mon Aug 06 00:00:00 CAT 2013>

for SimpleDateFormart("MMddyy").parse("3239")
expected <Tue Aug 06 00:00:00 CAT 2013> but was <Tue Aug 06 00:00:00 CAT 3>


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
compare two of the same dates made with these two formarts

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
for SimpleDateFormart("MMddyy").parse("3239")
expected <Tue Aug 06 00:00:00 CAT 2013>
ACTUAL -
for SimpleDateFormart("MMddyy").parse("3239")
expected <Tue Aug 06 00:00:00 CAT 2013> but was <Tue Aug 06 00:00:00 CAT 3>

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
if((new java.text.SimpleDateFormat("MMddyy").parse("082713")).equals((new java.text.SimpleDateFormat("yDDD").parse("3239")))){
    System.out.println(new java.text.SimpleDateFormat("MMddyy")+" == "+new java.text.SimpleDateFormat("yDDD"));
}else
{
    System.out.println((new java.text.SimpleDateFormat("MMddyy").parse("082713"))+" != "+(new java.text.SimpleDateFormat("yDDD").parse("3239")));
}
---------- END SOURCE ----------