[Qgis-user] How to filter features by date

[Mark Coletti]

I have an attribute type of "QDate" and I wish to filter out features that
are older than a given date.  However I cannot seem to come up with the
right magical incantation in the qgis filter to do so.

I do the following:

1. right-click on the vector layer and select "Filter ..."; the Query
Builder dialog appears
2. In the expression field I write:

"SampleTime" <= "2011/07/01"

For which I get the following error:

An error occurred when executing the query.

The data provider said:

OGR[3] error 1: Type mismatch or improper type of arguments to <= operator.

So how do I get this to work?

Thanks!

Mark
-- 
mcoletti at gmail.com
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