Bug 179898 Date/Time type X-Axis labels are not correct when set grouping [0001]
Description: Date/Time type X-Axis labels are not correct when set grouping. Build number: 2.2.0.v20070328-0630 Steps to reproduce: 1. New a Bar Chart with Date/Time type X-Axis with values as 4/1/2005 10:12 AM 4/1/2005 11:15 AM 4/1/2005 7:15 AM 2. Enable X Series Grouping, set Type as "DateTime", Unit as "Day", Interval as 1, and Aggregate Expression as "Sum". 3. Preview. Expected result: X-Axis label should be "4/1/2005" Actual result: X-Axis label is "2005" Error log: N/A
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/util/CDateTime.java
}
		else if ( iUnit == Calendar.WEEK_OF_YEAR )
		{
			final double dDays = computeDifference( cdt1, cdt2, Calendar.DATE );
			double rt = dDays / 7.0;
			if ( trimBelow )
			{
				rt = Math.floor( rt );
			}
			return rt;
		}
		else if ( iUnit == Calendar.MONTH )
		{
			if ( trimBelow )
			{
				final double dYears = cdt1.getYear( ) - cdt2.getYear( );
				return dYears * 12 + ( cdt1.getMonth( ) - cdt2.getMonth( ) );
			}
			else
			{
				
				final double dDays = computeDifference( cdt1,
						cdt2,
						Calendar.DATE );
				return dDays / 30.4375;
			}
		}
		else if ( iUnit == Calendar.YEAR )
		{
			if ( trimBelow )