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 0;
		}
	}
	/**
	 * Returns a preferred format specifier for tick labels that represent axis
	 * values that will be computed based on the difference between cdt1 and
	 * cdt2
	 * 
	 * @param iUnit
	 *            The unit for which a preferred pattern is being requested
	 * 
	 * @return A preferred datetime format pattern for the given unit
	 */
	public static final String getPreferredFormat( int iUnit )
	{
		if ( iUnit == Calendar.YEAR )
		{
			return "yyyy"; 
		}
		else if ( iUnit == Calendar.MONTH )
		{
			return "MMM yyyy"; 
		}
		else if ( iUnit == Calendar.DATE )
		{
			return "MM-dd-yyyy"; 
		}
		else if ( iUnit == Calendar.HOUR_OF_DAY )
		{
			return "MM-dd-yy\nHH:mm";