Why use datetime and not mktime?

Question

MySQL

Friends, perhaps a very stupid question, but not obvious to me.
Why use datetime and not mktime? After all, mktime is pure numbers, it will be faster to search for them in the database, or am I not understanding something?
What should I use for a highly loaded resource, and why would it be easier to make a selection from the database?

Answer 1

DATETIME at the engine level is stored like timestamp 20160222182145 for example.
In each situation, they choose according to task
A read this
https://habrahabr.ru/post/61391/