I know this is very old, but for the next user it can help with the solution.
You can specify the date format to use.
public static final Intent getTimeChartIntent(Context context, XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer, String format) { return getTimeChartIntent(context, dataset, renderer, format, ""); }
To show only the day and month, use something like the following:
Intent intent = ChartFactory.getTimeChartIntent(context, dataset, mRenderer, "dd-MMM");
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