As I can't reproduce your issue I'm not able to fix this by myself.
I need your help.
Check if agenda printout has issue with days - if it has then...
Please go edit source code file: modules/CRM/Calendar/Event/Event_0.php line 176
There should be a line:
'details'=>array('weekday'=>__date('l', strtotime($start)))));
Please replace it with
'details'=>array('weekday'=>__date('l', $ev['start']))));
Print the agenda once again and check for the issue.
Regards,
Adam