How to store a time interval in a database (mysql)?

Question

MySQL

I need to store the number of days-hours-minutes-seconds in the field to add this number to the saved date. How can I do that?
Example.
Field A stores 2000-01-01 00:00:00
Field B stores ????-??-01 00:05:00 = 1 day and 5 minutes, how can this be stored?
Or is it possible to store the interval only in seconds as an integer?

Answer 1

Consider the TIMESTAMP field type and yes you can seconds and just add to it

Answer 2

Redis

Answer 3

For a similar task at the time, I made two columns - INT = day number and TIME - time.
The advantage is that they can be shown directly to the user, and also saved without conversion.
In general, you can store at least the number of seconds, but then there will be a jamb with the translation of the clock (now it is no longer relevant, but suddenly).
And the date to which to add is already a full-fledged date-time with a time zone.