The calendar form (node/%node/availability) doesn't show availability correct

It all shows initial values.

This corrected it:

hotel_booking.calendars.inc line 166:

- $ref_date = new DateObject($day['calendar_dt'], date_default_timezone(), DATE_FORMAT_ISO);
+ $ref_date = new DateObject(date(DATE_FORMAT_ISO, strtotime($day['calendar_dt'])), date_default_timezone(), DATE_FORMAT_ISO);