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
* @param interval
	 *            the interval value as a string
	 * @throws SemanticException
	 *             if the property is locked or the input value is not one of
	 *             the above.
	 */
	public void setInterval( String interval ) throws SemanticException
	{
		setStringProperty( INTERVAL_PROP, interval );
	}
	/**
	 * Returns the interval range of this level.
	 * 
	 * @return the interval range value as a double
	 */
	public double getIntervalRange( )
	{
		return this.getFloatProperty( INTERVAL_RANGE_PROP );
	}
	/**
	 * Returns the interval range of this level.
	 * 
	 * @param intervalRange
	 *            the interval range value as a double
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setIntervalRange( double intervalRange )
			throws SemanticException
	{