Bug 214197 [Regression] Auto scale does not work correctly [13]
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/AutoScale.java
sc.bStepFixed = true;
				sc.bMaximumFixed = true;
				sc.bMinimumFixed = true;
				sc.computeTicks( xs,
						ax.getLabel( ),
						iLabelLocation,
						iOrientation,
						dStart,
						dEnd,
						false,
						null );
				return sc;
			}
		}
		else if ( ( iType & DATE_TIME ) == DATE_TIME )
		{
			Calendar cValue;
			Calendar caMin = null, caMax = null;
			dsi.reset( );
			while ( dsi.hasNext( ) )
			{
				cValue = (Calendar) dsi.next( );
				if ( cValue == null ) 
				{
					continue;
				}
				if ( caMin == null )
				{
					caMin = cValue;
				}