Hi ! I have added this as a FAQ to http://zdp.zope.org/projects/zfaq/faq/DTML#952258570 As ZDP members you can become Maintainer of the question and answer objects. Greetings, Maik Röder How do I use bobobase_modification_time on a file object ? To get the modify time for a file, use this code in a DTML document or method : <dtml-with yourFileName> <dtml-var bobobase_modification_time> </dtml-with> or <dtml-var "yourFileName.bobobase_modification_time()"> If your filename includes a dot, use instead: <dtml-with "_['yourFileName.gif']"> <dtml-var bobobase_modification_time> </dtml-with> or <dtml-var "_['yourFileName.gif'].bobobase_modification_time()">