MySQL Date insert


I have a date for example in the following format in column A

03/03/2020 01:48:18 pm (Currently Month, Day, Year and 12 hour format for time)

I would like to read the date in Column A and insert into Column B into the following format

2020/03/03/ 13:48:18( Need format Year, Month, Day and 24 hour format)

Would like a query to search for all records in Column A and insert into Column B , row for row