Mysql Wrong Date Format, Wrong Column Type

To fix a situation where you have a date formatted as 12/25/2015 in a varchar column type and want to store the correct date format in a date column, run the following query and then you can change the column type. UPDATE your_table
SET date_field = DATE(STR_TO_DATE(date_field, '%m/%d/%Y'))
WHERE DATE(STR_TO_DATE(date_field, '%m/%d/%Y')) <> '0000-00-00';