AnalyticsReportFilter Date/DateTime filters format

Content

I cannot seem to get the reports to filter properly by DATE or DATETIME datatypes.  What format do we need to send the filter value in as???

 

I've used the following but none seem to work:

09/08/2011

2011-09-08

20110908

20110908T00:00:00Z

2011-09-08T00:00:00Z

and others ...

I've tried operators = and RANGE but no records are ever returned.  I've also tried defining the DataType as STRING but either all records are returned or none. 

The DataType from the Report Definition is Date Time.

All other datatypes we've tested work fine but the date fields are not cooperating.

 

Please advise.