In other words: Is there a way to mark the calendar by default as completely unavailable and then specify just time periods where the scheduler is available? So, if a person's day starts at 9:00 AM and ends at 5:00 PM, but they're only available from 3:00 PM to 4 PM, is there a way to mark 9 AM - 3 PM as taken and 4 PM - 5 PM as taken without having to specifically create appointments for those intervals?