Presentation of values on the axis

[#1]

I want to change the presentation of values of x-axis in the chart attached below as an image. In the chart, the values on x-axis are dates but i want to show the values in M'YY format.

EX: if date is 5/1/2011, then i just want to show it like May'11 on the x-axis.

[#2]

so you can use expression as a dimension (calculated dimension)

=date(datedimansionname,'MM-YY')

[#3]

try this

Date

(DateField,'MMM-YY')