This represents the initial date and time of the appointment, formatted as yyyy-mm-dd hh:mm:ss. Please note that if no timezone information is provided, the value is assumed to be in Coordinated Universal Time (UTC).
Example 1: 2023-12-21 11:00:00-05:00 = 11:00 am Eastern Standard Time
Example 2: 2023-12-21 11:00:00-04:00 = 11:00 am Eastern Daylight Time
Example 3: 2023-12-21 11:00:00 = 11:00 am Coordinated Universal Time (UTC)