Expiration date for a product

After 1.6 update, I got a new bug !
For a product, it's impossible to set expiration date HOUR correctly.

If I set 2012-11-18 23:59
it's changed after save to 2012-11-19 00:59 or other various hours depending on the date.
If I set other hours, it's changed to others...
2012-11-18 23:58 --> 2012-11-19 00:58

Could you help me to fix that ?
Thanks

Hi,

I tried on my end and it's working fine.
In HikaShop, for the expirations date we can only set a day, not an hour.
We automatically set 00:00, if it display 0:58, I think that it come from the timestamp, tour server is maybe located at GMT +1.

It was working long before my post, and is working know.
I suppose it was a pb with my overloaded configuration.
Thanks a lot