What are common errors or issues that can occur when handling dates in PHP applications?

One common issue when handling dates in PHP applications is incorrect date formatting, which can lead to unexpected results or errors in date manipulation functions. To solve this, always ensure that dates are formatted correctly using the appropriate date() function or DateTime object.

// Example of correctly formatting a date using date() function
$date = date('Y-m-d H:i:s', strtotime('2022-01-15'));
echo $date;