Axis.BaseUnit Property (PowerPoint)
Returns or sets the base unit for the specified category axis. Read/write XlTimeUnit.
expression A variable that represents an 'Axis' object.
Setting this property has no visible effect if the CategoryType property for the specified axis is set to xlCategoryScale. The set value is retained, however, and takes effect when the CategoryType property is set to xlTimeScale.
You cannot set this property for a value axis.
Note Although the following code applies to Microsoft Word, you can readily modify it to apply to PowerPoint.
The following example sets the category axis for the first chart in the active document to use a time scale, using months as the base unit.
With ActiveDocument.InlineShapes(1) If .HasChart Then With .Chart .Axes(xlCategory).CategoryType = xlTimeScale .Axes(xlCategory).BaseUnit = xlMonths End With End If End With