[Zope] using if with date values

I would like to insert into the this sql table the form variable birth.x. I would like to do it only if the date variable identification.birthdate is greater the that listed below. I know the current 'if' statement is incorrect and probably not even close. However, I haven't been able to find any documentation. Any ideas or solutions would be appreciated. <!--#if expr="identification.birthdate > '08/01/2000' "--> INSERT INTO inventory (x) VALUES ( <!--#sqlvar birth.x type=string --> ) <!--#/if-->