[Zope] searching a Z-Catalog for a range of values

[Tom Palermo]

Does anyone know how I can search a Z-Catalog for a using a time range. I
tried to do the following but it doesn't seem to work:

<dtml-in "catalog(bobobase_modification_time=_.ZopeTime( )-1,
bobobase_modification_time_usage='range:max')

I got this code snippet from the Advanced Z-Catalog Searching How To. Any
suggestions would be greatly appreciated.
email me at tom@bcswebservices.net