[flexcoders] Dates Display Wrong on Random Clients?

[javadmanx]

I have an application that's displaying a date. I've had a couple
people contact me saying it was displaying the wrong date. I've only
found on Windows XP machine with Flash Player 9 that does it. It looks
as if it's offset negative by one day. So my 11th is a 10th now.
Anyone know why? I'm confused on this. It's displayed in a list with a
label format function using the toDateString() of a date object. I'm
using Flex Builder 3, Blaze DS and Java BDB.