making reservation in another language not working

Hi. This is a pre-purchase question to make sure i can get the plugin working for me. I have a site using multiple languages and when I try to make a reservation using Czech language, it gives me a date picker that is 3 months ahead. Moreover, if i select a date, the system hangs. This is not the case if i was using other languages like French or Slovak when the calendar shows the present date and i can easily select a time.