After struggling hard for few days , trying to change the datetimepicker class to fetch the default classes which by the way
was working stand alone but could not work with this page.
Tried changing the display tags class which was causing a whole lot of other problems ..
I finally found Jcalendar
which is open-source .. This is really really good calendar
Integrated this into my struts application and it worked like a charm ... and it supports many other themes and styles also ...