SELECT LAST_DAY(DATE_ADD(NOW(), INTERVAL 12-MONTH(NOW()) MONTH)); //It shows this year (2017)'s last day. ==> 2017-12-31

++++This Year++++ | ++++Last Year's Last Day++++

   2017           |        2016-12-31
   2018           |        2017-12-31
   2019           |        2018-12-31
   2020           |        2019-12-31