Solusi ini menyediakan operasi CONVERT_IMPLICIT untuk kondisi Anda dalam predikat
SELECT *
FROM xxx
WHERE CAST(dates AS date) BETWEEN '1/1/2013' and '1/2/2013'

ATAU
SELECT *
FROM xxx
WHERE CONVERT(date, dates, 101) BETWEEN '1/1/2013' and '1/2/2013'

Demo di SQLFiddle