Reverse engineer simpleDateFormat

We've been processing some data for a few months using the simpleDateFormat class. as in...
simpleDateFormat.applyPattern("dd-MM-yyyy");
new date = simpleDateFormat.parse(rawDateString);
problem is, the dates started coming in as yyyy-MM-dd and things got screwed up. so a date like
2004-09-25
gets read as
0031-02-25
or Feb 25, 31AD
amazingly we only noticed this after 2 months... we can re-process the data but would like to find a way of reverse engineering simpleDateFormat so that we can go from 0031-02-25 to 2004-09-25 reliably. that way we can just run through our database and re-format all the dates instead of re-processing.
I've been trying to browse the java source to figure it out, but thought I'd post something in case someone is more familiar and can come up with a quick answer.
thanks

Your process currently is working, right? Unless it would take "too long" (whatever that means in your context) to reprocess the records, then making a new process to convert the data would just be an opportunity to write more bugs.

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