title: JFreeChart xAxis as milliseconds
body: <p>in JFreeChart my date values are coming into my program in the form of long time in milliseconds. I therefore convert it to <code>RegularTimePeriod</code> class using <code>FixedMillisecond</code> class. Unfortunately, the chart I am displaying is still using the milliseconds as the xAxis values, rather than printing nice dates/days etc. toString method on <code>FixedMillisecond</code> class returns very nice, formatted string denoting day, hour, seconds etc. but it is not the case for the axis rendering. Is there a way to override this behaviour?</p>