Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/AxesRenderer.java
final long l1 = ( (DateTimeDataElement) de1 ).getValue( );
				final long l2 = ( (DateTimeDataElement) de1 ).getValue( );
				return ( l1 < l1 ? IConstants.LESS : ( l1 == l2
						? IConstants.EQUAL : IConstants.MORE ) );
			}
			else if ( de1 instanceof TextDataElement )
			{
				throw new ChartException( ChartEnginePlugin.ID,
						ChartException.DATA_FORMAT,
						"exception.unsupported.compare.text",  
						Messages.getResourceBundle( getRunTimeContext( ).getULocale( ) ) );
			}
			else
			{
				throw new ChartException( ChartEnginePlugin.ID,
						ChartException.DATA_FORMAT,
						"exception.unsupported.compare.unknown.objects", 
						new Object[]{
								de1, de2
						},
						Messages.getResourceBundle( getRunTimeContext( ).getULocale( ) ) ); 
			}
		}
		throw new ChartException( ChartEnginePlugin.ID,
				ChartException.DATA_FORMAT,
				"exception.unsupported.compare.different.objects", 
				new Object[]{
						de1, de2
				},
				Messages.getResourceBundle( getRunTimeContext( ).getULocale( ) ) );