strange date problem: 2015-11-23 08:10

dear list members

i have a strange date problem: when creating zope objects, like a  
zope file or folder, the date is always set to 2015-11-23 08:10. this  
is zope-2.7.3. we have a content management system (silva) where the  
dates of new created silva objects in the silva content management  
system is correct, but down in the zmi it is always 2015-11-23 08:10.  
the consequence of this problem is that i cannot pack the ZODB anymore.

can anybody tell me how to fix this problem? does an upgrade to  
zope-2.7.8 fix this problem? and how can i change the date of the  
objects in the future?

thanks for any advice.

regards,
marc