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
{
				return cdt1.getYear( ) - cdt2.getYear( );
			}
			else
			{
				
				final double dDays = computeDifference( cdt1,
						cdt2,
						Calendar.DATE );
				return dDays / 365.25;
			}
		}
		return 0;
	}
	/**
	 * Walks through all values in a dataset and computes the least significant
	 * unit for which a difference was noted.
	 * 
	 * @param dsi
	 *            The dataset iterator that facilitates visiting individual
	 *            values
	 * 
	 * @return The least significant unit for which a difference in datetime
	 *         values was noted
	 */
	public static final int computeUnit( DataSetIterator dsi )
	{
		Calendar cCurr, cPrev;
		for ( int k = 0; k < iaUnitTypes.length; k++ )
		{