MySQL: Counting column from different tables on a certain timeframe -

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i have following query: 

select sum(counted) tcounted      (select counted `clicks`.`t1`           union           select counted `clicks`.`t2`           union           select counted `clicks`.`t3`          ) tmp

where , how add time constraint? want count between dates... sorry mysql noobness.

thanks!

select sum(counted) tcounted      (select counted `clicks`.`t1` somedatecol between somedate , somedate           union           select counted `clicks`.`t2` somedatecol between somedate , somedate           union           select counted `clicks`.`t3` somedatecol between somedate , somedate          ) tmp`

http://dev.mysql.com/doc/refman/5.0/en/select.html


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