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Gets or sets the DateTime value determining the start date and time of the appointment.
public DateTime Start { get; set; }
<p>If the <xref href="C1.Schedule.Appointment.AllDayEvent" data-throw-if-not-resolved="false"></xref> property is set to true,
then the start date of the appointment is the Date of the Start, and the start time of the appointment is 0:00.
At setting this property, if it's time is not equal 0:00, the AllDayEvent property will be set to false.