You can change your calendar settings in the page menu on the Calendar page. Click on the "Calendar settings" option:
In that menu, you'll find the option to select your location to set the timezone. Underneath the time zone, select your preferred format for the time and date (American time/date or International time/date). Using the option below format, select a "Week start day" for the week calendar view to start on a different day. Be sure to hit save after making any changes!