[Zope] what time is it ?

Can anyone explain why I get these strange results: ZopeTime = <dtml-var ZopeTime><br> gives : ZopeTime = 2002/04/05 10:02:41.694 GMT+2 and Bobobase_modification_time = <dtml-var bobobase_modification_time> gives Bobobase_modification_time = 2002/04/04 16:39:58.2995 GMT+2 when at the time of editing we were effectively at the time given by ZopeTime, so in my mind both should be the same? NB Our time zone is France (GMT + 2) Thanks