Change datetime format of x-axis?

Question

I have a TChart with an area series. The area Points are mapped to datetime values. How can I change the format of the date labels on the x-axis?

This does not work:

area.add(new DateTime(timestamp), value); // Date value!
...
chart.getAxes().getBottom().getLabels().setDateTimeFormat("MMM 'yy");

Answer 1

This gives me an IllegalArgumentException:

new DateTime(2012,1,1).toString("MMM 'yy");

The comma ' in the string format argument is unnaccepted.

As you can read here, the single quote is used to avoid interpretation. Put two single quotes to draw a single quote:

new DateTime(2012,1,1).toString("MMM ''yy");