I need my query to select unix timestamps which range from a particular past date till now?For example I need to select '2013-01-01' till current date. I was able to do it for a particular year. Any help would be appreciated.

```
SELECT mdl_user_info_data.data, mdl_user.firstname, mdl_user.lastname, mdl_user.id   AS  userid, SUM( mdl_quiz.fcpd ) AS cpdtotal
FROM mdl_grade_grades
INNER JOIN mdl_user ON mdl_grade_grades.userid = mdl_user.id
INNER JOIN mdl_grade_items ON mdl_grade_grades.itemid = mdl_grade_items.id
INNER JOIN mdl_quiz ON mdl_grade_items.itemname = mdl_quiz.name
INNER JOIN mdl_course ON mdl_grade_items.courseid = mdl_course.id
INNER JOIN mdl_user_info_data ON mdl_user.id = mdl_user_info_data.userid
WHERE mdl_user_info_data.fieldid =1
AND mdl_grade_items.itemname IS NOT NULL
AND YEAR( FROM_UNIXTIME( mdl_grade_grades.timemodified ) ) =2013
GROUP BY mdl_user.id

```