Yes My Calendar's off by one day too. Month view anyway, Day View & Week View are Ok.
Problem being it's only month view I'm interested in...

PHP Version 5.2.17
Joomla! 2.5.4 Stable
Joomla Platform 11.4.0 Stable
ARTIO Booking
Version: 1.3.9
Date: 2012-03-23

One other thing if I may head off-topic? Is it possible to enter percentages at all? Eg our SBS (Single Booking Supplement) is a simple 10% over usual price. The abilty to add 10% SBS after all other calculations performed would really clean the entire system up. Currently each item requires three separate price tiers.

Thanks in advance,

Milo