Clock and Date Reset

I have Macbook Pro Mid 2010 running on Lion 10.7.4
Every time I run out of battery and automatically shutdown, I get a message that my date is set to before 2001 and causing applications to behave irradically when I boot up for the first time.
I need to change the clock and date in the system pref.
This won't be happen if I shutdown the computer intentionally or make it sleep with enough battery.
Why this is happen? How to fix this issue?
It seems that the "safe deep sleep / hibernation" when the battery is running very2 low  is not working.
Thank you,
Setiawan T.

Basically why I asked this question is :
On Snow Leopard, when the battery reaching its "danger zone", let's say I forget to turn my MBP off when I go out for lunch, It will automatically deep sleep / hibernate. So I don't experience this kind of problem.
However since I upgrade to Lion, I face this problem. It won't hibernate everytime the battery reach it's danger zone. Thus the clock and date are being reset.
Regards.

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