[Zope] Differents of two ZopeTime

Hello zope, I want to measure the time of process in Zope. sd=context.ZopeTime() ... se=context.ZopeTime() d=se-sd print str(DateTime(str(sd)) print str(DateTime(str(se)) it is working, so it is show the two datetimes. But how to I show the different of the times ? print str(DateTime(str(d)) is not working good ! Please help me ! Thanx for it ! -- Best regards, fowlertrainer mailto:fowlertrainer@anonym.hu