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
setFloatProperty( INTERVAL_RANGE_PROP, intervalRange );
	}
	/**
	 * Sets the interval range of this level.
	 * 
	 * @param intervalRange
	 *            the interval range value as a string.value is locale
	 *            dependent.
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setIntervalRange( String intervalRange )
			throws SemanticException
	{
		setStringProperty( INTERVAL_RANGE_PROP, intervalRange );
	}
	/**
	 * Returns the level type of this level. The returned value is one of:
	 * 
	 * <ul>
	 * <li><code>LEVEL_TYPE_DYNAMIC</code>
	 * <li><code>LEVEL_TYPE_MIRRORED</code>
	 * </ul>
	 * 
	 * @return the level type
	 */
	public String getLevelType( )
	{
		return getStringProperty( LEVEL_TYPE_PROP );
	}