Update only Time in a mysql DateTime field

Question

How can I update only the time in an already existing DateTime field in MySQL? I want the date to stay the same.

Answer 1

This what helped me. I convert time to minutes firstly: 150 for 2:30 am.

UPDATE lesson SET starts_at = DATE_ADD(Date(starts_at), INTERVAL 150 MINUTE)

Minutes are enough accurate for me, though you can use other units: https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_date-add