The was some talk long ago about calendar support of some kind in Principia. I don't know wwhatever became of that or what kind of features people were wanting, but this weekend I sat down and wrote a calendar DTML widget. You can try a sample instance of it at: http://www.endicor.com/zope/test/Calendar Those of you with Palm Pilots will find the interface familar :-) The sample page is generated with this source: <!--#var standard_html_header--> <!--#calendar--> <!--#var "_.string.upper(mode[0])"-->: <!--#var date fmt=Date--> <!--#/calendar--> <!--#var standard_html_footer--> The chunk of code within the calendar tag is used to render the individual cells in the calendar display. It's called for each cell with the name 'date' bound to the date to be displayed, and 'mode' bound to either 'day', 'week', or 'month' depending on what mode the calendar display is in. The calendar tag takes a few optional arguments, including mode to start in (defaults to 'month') and an expression to compute the date to start on (default to current date if unspecified). Anyway, have a look. If you think it'd be useful to you, let me know!