Problem with DateBox

Hey, 

I use a DateBox in my webapp to store birthdays. Now something strange happend. 

If i compile my project and run it on my server. The DateBox decrease the birthday by one day each time I save the form. 

But it only happens when the month is bigger than 7. 

Maybe there is a problem with winter and summer time? Or some promblems with the parser?

Does anyone has a idea why this happen?

Thanks in advance

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