/ intervalRange ) );
/ getDateIntervalRange( ) ) );
	public Object calculate( Object value )	{		if ( value == null )		{			return new Double( -1 );		}		if ( intervalStart == null )		{			return new Double( Math.floor( DateTimeUtil.diffHour( defaultStart,					(Date) value )					/ intervalRange ) );		}		else		{			if ( DateTimeUtil.diffHour( (Date) intervalStart, (Date) value ) < 0 )			{				return new Double( -1 );			}			else			{				return new Double( Math.floor( DateTimeUtil.diffHour( (Date) intervalStart,						(Date) value )						/ intervalRange ) );			}		}	}