TimeSimpleDataset Dataset1 = new TimeSimpleDataset("Actual Sales",x1,y1);
TimeCoordinates pTransform1 = new TimeCoordinates();
pTransform1.AutoScale(Dataset1, ChartObj.AUTOAXES_FAR , ChartObj.AUTOAXES_FAR);
// Force start of y-scale to 0
pTransform1.SetScaleStartY(0);

// subtract 24 days from x-scale starting time
ChartCalendar start = pTransform1.GetTimeScaleStart();
start.Add(ChartObj.DAY_OF_YEAR, -24);
pTransform1.SetTimeScaleStart(start);

// add 6 days to x-scale ending time
ChartCalendar stop = pTransform1.GetTimeScaleStop();
stop.Add(ChartObj.DAY_OF_YEAR, 6);
pTransform1.SetTimeScaleStop(stop);