Hi. I´m using the free version.

Is it possible to change the weekdays and month to my native language instead of using the english ones ??

Dear Tommy,

Yes it is possible. But you will have to translate them manually by translating the file .ini (for Spider Calendar)in language folder of your Drupal site.

I´ve done a wildcard search (*.ini) in Drupal root install folder but there´s no .ini file regarding Spider Calender.

I´m using Drupal v7.23

Dear Tommy,

It seems that you should translate the module. You can find an answer to your question in www.drupal.org