Bug 196894 BIRT Cross tab, Cube - Time dimension enhancements
There were a couple of time dimension related enhancments planned post BIRT 2.2. This entry is to track those. This enhancments also includes - supporting additional predefined data time formats, that could make it easier to define data time dimension and use it in data items.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/olap/LevelHandle.java
public String getDateTimeLevelType( )
	{
		return getStringProperty( DATE_TIME_LEVEL_TYPE );
	}
	/**
	 * Sets the date-time type of this level. The allowed values are defined in
	 * {@link org.eclipse.birt.report.model.api.elements.DesignChoiceConstants},
	 * and they are:
	 * <ul>
	 *  <li>DATE_TIME_LEVEL_TYPE_YEAR
	 * <li>DATE_TIME_LEVEL_TYPE_MONTH
	 * <li>DATE_TIME_LEVEL_TYPE_QUARTER
	 * <li>DATE_TIME_LEVEL_TYPE_WEEK
	 * <li>DATE_TIME_LEVEL_TYPE_DAY
	 * <li>DATE_TIME_LEVEL_TYPE_HOUR
	 * <li>DATE_TIME_LEVEL_TYPE_MINUTE
	 * <li>DATE_TIME_LEVEL_TYPE_SECOND
	 * </ul>
	 * 
	 * @param dateTimeType
	 *            the date-time type to set
	 * @throws SemanticException
	 *             if the dateTimeType is not in the choice list.
	 */
	public void setDateTimeLevelType( String dateTimeType ) throws SemanticException
	{
		setStringProperty( DATE_TIME_LEVEL_TYPE, dateTimeType );
	}
}