¿No puedes simplemente usar esto?
SELECT `date` FROM staff WHERE `date` < NOW() ORDER BY `date`
o (si solo necesita fechas diferentes)
SELECT DISTINCT `date` FROM staff WHERE `date` < NOW() ORDER BY `date`
¿No puedes simplemente usar esto?
SELECT `date` FROM staff WHERE `date` < NOW() ORDER BY `date`
o (si solo necesita fechas diferentes)
SELECT DISTINCT `date` FROM staff WHERE `date` < NOW() ORDER BY `date`