SimpleListFilter filter UserProfile

Hi all !

I want filter a field of UserProfile (field name: timestamp),

models.py:   http://dpaste.com/764723/

admin.py:   http://dpaste.com/764724/

But when I press the filter, browser show:   http://dpaste.com/764725/

--- --- --- --- --- --- --- --- --- ---

According the error message, I can get class "UserProfile",
but if I want to  filter timestamp, how should I do ?

thx :-)

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