What best practices should be followed when handling time calculations in PHP and JavaScript?

When handling time calculations in PHP and JavaScript, it is important to ensure that you are using the correct time zone settings and consistent date formats to avoid any discrepancies. Additionally, it is recommended to use built-in date and time functions provided by PHP and JavaScript to accurately perform calculations. PHP Code Snippet:

// Set the default time zone
date_default_timezone_set('America/New_York');

// Get the current timestamp
$currentTimestamp = time();

// Perform time calculation (e.g. adding 1 hour)
$newTimestamp = strtotime('+1 hour', $currentTimestamp);

// Format the new timestamp
$newTime = date('Y-m-d H:i:s', $newTimestamp);

echo $newTime;