Administrative Data

First of all, sorry for my bad english.
i've created some administrative data, of type date. When i start ocs invetory in spanish, the calendar starts in january of 1970, and when i modify the date and press OK, these changes don't take effect.
If i start ocs invetory in english, the calendar starts in today, and when i modify the date, these changes if they are taken into consideration.

If i make a mass affectation, at first, these changes if they are taken into consideration, but from around the 600 machine affected, these changes don't take effect.