OlkTimeControl.IntervalTime Property (Outlook)
Returns or sets a Date that specifies the number of minutes displayed as an interval used for the olTimeStyleTimeDuration style setting on the time control. Read/write.
The default value is 30.
The minimum value for IntervalTime is 1 and the maximum value is 1440. Assigning a value outside of this range will result in the nearest edge value being used instead.
When Style is olTimeStyleTimeDuration, the date control displays the value of ReferenceTime as the first selectable time value, shows additional intervals (specified by IntervalTime) starting from the ReferenceTime value, and shows the duration of an event.
The default value for ReferenceTime is 30 Dec 1899 12:00 AM. In this case, the time control will display 30 Dec 1899 12:00 AM as the first selectable time. A value of 60 for IntervalTime will mark 30 Dec 1899 1:00 AM as the first interval.