I have a table with dates that all happened in the month November. I wrote this query
select id,numbers_from,created_date,amount_numbers,SMS_text from Tes
Try to use "#" before and after of the date and be sure of your system date format. maybe "YYYYMMDD O YYYY-MM-DD O MM-DD-YYYY O USING '/ O \' "
Ex:
select id,numbers_from,created_date,amount_numbers,SMS_text from Test_Table where created_date <= #2013-04-12#