How can users ensure the accuracy of date calculations when dealing with different date formats in PHP and MySQL?

When dealing with different date formats in PHP and MySQL, users can ensure the accuracy of date calculations by converting dates to a consistent format before performing any calculations. One way to do this is by using PHP's date() function to format dates consistently before storing them in the database or performing calculations. By standardizing the date format, users can avoid errors and ensure accurate date calculations across different systems.

// Convert date to a consistent format before storing in MySQL
$original_date = "2021-10-15";
$formatted_date = date("Y-m-d", strtotime($original_date));

// Perform date calculations using the standardized format
$new_date = date("Y-m-d", strtotime($formatted_date . " + 1 day"));
echo $new_date;