What are some common errors or misunderstandings that PHP developers may encounter when working with date functions and formats?

One common error is incorrectly using the date format characters in PHP date functions, resulting in unexpected output or errors. To solve this, developers should refer to the PHP manual for the correct format characters and syntax.

// Incorrect date format usage
$date = date('MM/dd/yyyy'); // should be 'm/d/Y'

// Correct date format usage
$date = date('m/d/Y');