How to convert date to datetime in PHP?

This post converting the Date format to DateTime format with beginning and end of that day in php.

1. Code:

2. Example:

Input:

$str = "20/06/2022";
convertDateToDateTime($str, false);
convertDateToDateTime($str, true)

Output:

20/06/2022 23:59:59
20/06/2022 00:00:00
PHP