Bug 177693 Support Date/Time data type in BIRT report engine.
Report engine needs to support new BIRT data type Date/Time. Please see attached for details.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/ReportParameterConverter.java
* is it return a Double object when the value type is Float.
	 * 
	 * @param reportParameterValue
	 *            report parameter value in string.
	 * @param parameterValueType
	 *            report parameter type.
	 * @return parameter value object.
	 */
	public Object parse( String reportParameterValue, int parameterValueType )
	{
		Object parameterValueObj = null;
		
		if ( reportParameterValue != null && locale != null )
		{
			switch ( parameterValueType )
			{
				case IScalarParameterDefn.TYPE_STRING:
				{
					StringFormatter sf = new StringFormatter( ULocale.forLocale(locale) );
					
					if ( format != null )
					{
						sf.applyPattern( format );
					}
	
					try
					{
						parameterValueObj = sf.parser( reportParameterValue );
					}
					catch ( ParseException e )