在POST / PUT之前将时间（MM：SS）转换为float（秒）到数据库

I want a user to be able to select or enter a time (ex: "how long do you spend brushing your teeth in the morning?") and on the 'CREATE' or 'UPDATE' actions, I would like to convert the time to a float of seconds before the post/put to the database. I want a user to be able to select or enter a t