Bug 212371 [Regression] Auto-scale does not work correctly and gridline is not shown anymore when run the attached java file [13]
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/AutoScale.java
}
				if ( ( (Number) oStep ).doubleValue( ) < dPrecision )
				{
					oStep = new Double( oldStep ); 
					return false; 
				}
			}
		}
		else if ( ( iType & DATE_TIME ) == DATE_TIME )
		{
			int[] ia = null;
			int iStep = asInteger( oStep );
			int iUnit = asInteger( oUnit );
			for ( int icu = 0; icu < iaCalendarUnits.length; icu++ )
			{
				if ( iUnit == iaCalendarUnits[icu] )
				{
					ia = iaCalendarDeltas[icu];
					if ( ia == null ) 
					{
						iStep--;
						if ( iStep == 0 )
						{
							oStep = new Integer( iaMonthDeltas[iaMonthDeltas.length - 1] );
							oUnit = new Integer( Calendar.MONTH );
						}
					}
					else
					
					{