COLDATE is compared to the CollectionsDate attribute of the case (see Collections attributes for more on this attribute), returning any cases whose CollectionsDate meets both of the following conditions:
it as on or after the COLDATE
it is prior to the date on which the SEARCHCASES call is run
format: mm/dd/yyyy
COLDATE=05/12/2010
COLDATE=ALL. Note 9/23/2013: the "ALL" query is no longer supported.