I haven't made that particular change, but have faced similar requests. Your options are-
- Use Javascript (jQuery) to reformat on client side
- Dig around in the workarea looking for formatting code, though usually the formatting code is locked up in a DLL.
- DisplayXslt or EkMarkup - some controls allow you to apply XSLT or EkMarkup (Ektron markup template) for custom display. You create an XSLT, and apply it via the DisplayXslt property on the control.
- Discard the control, and use the APIs to drive your own custom control.
Also, this Ektron forum post suggests having a look at this file- workarea/webcalendar/xsl/default.xsl
If this file exists (I don't have an Ektron installation currently handy), then it is likely you can use the DisplayXslt method described above.