How to use postgres ::date with knex.js

I have a column of type timestamp. I need to select all records by given date. In sql it's something like:

select * from "table" where "date"::date = '2015-08-22';

I tried following:

db('table').select().where('date::date', '=', date);

But this throws error

error: select * from "table" where "date::date" = $1 - column "date::date" does not exist

because knex place quotes wrong.

Is there any way to perform such query? Or I should use whereRaw?