Some cool MySQL date manipulation stuff

SELECT unix_timestamp( curdate(  )  )  AS TODAY, unix_timestamp( DATE_SUB( curdate(  ) ,  INTERVAL 1 YEAR )  )  AS LASTYEAR, unix_timestamp("2005-10-01")  AS THISQUARTER, unix_timestamp(DATE_SUB("2005-10-01",  INTERVAL 1 YEAR) )  AS LASTQUARTER

SELECT (unix_timestamp("2005-11-15") - unix_timestamp("2005-10-01")) / 86400

SELECT  * FROM  mail_stats WHERE DATE_SUB(DATE_FORMAT( complete_date,  "%Y-%m-%d"  ),INTERVAL 1 DAY)  =  "2005-11-09"