How to split datetime column into datetime? (ultimately need to run query "same day but later")?

Question

SQL

How to split datetime column into datetime ? (ultimately it is necessary to execute the query "on the same day, but later") ?

Answer 1

If in php

$arr = implode(' ', $date);
$arr[0] //дата
$arr[1] //время

Answer 2

SELECT DATE_FORMAT (opers.op_dattime yyyy.mm.dd) is this what the query should look like ? opers - table , op_dattime - date in format yyyy.mm.dd hh:mm:ss) ?