When you book your appointment please make sure to select the correct time zone/location you will be in for the dates you are considering for your appointment. You will see this option (with drop down menu showing possible time zones) within the scheduling tool in the bottom corner of the scheduling window.

Important: Selecting the correct time zone you will be in for your preffered appointment is essential, as the calendar will then show you the available appointment times for your selected date in the local time of the time zone you select.