[SOLVED] mod_yj_booking problems - Date of arrival/departure

Hi there

I am having problems with the arrival/departure option

When my clients want to select their check-in/check-out time
the months go like this:October,November,November instead of
October,November,December
Also the years show
2007/2008/2009/2010
I would like it to show
2009/2010/2011/2012

I tried changing this in the mod_yj_booking.php
and yes it was set to October,November,November so I fixed it and uploaded the mod_yj_booking.php file, but there was no change even after cleaning the cache.

Do I have to change it, save it and upload the whole module/ or change it, save it, zip it and upload it through the joomla backend?

thanks in advance