In conjunction with MajorUnitValue, determines the time interval between axis labels and major tick marks for category axes with a DisplayType of TimeScale.

 public AxisTimeUnit MajorUnit{ get; set; }

Public Property MajorUnit() As AxisTimeUnit

This value specifies the units of measurement when determining how frequently there will be data labels on a time-scaled category axis. For example, if MajorUnit is set to Month and MajorUnitValue is set to 6, then there will be 6 months between every label.

The default value for newly created charts in ExcelWriter is Days.

This property has no effect for category axes with a DisplayType of Category.