How can the use of Javascript to determine a user's time zone and pass it to PHP for timestamp conversion be optimized to avoid inaccuracies caused by manual time adjustments on devices?

To avoid inaccuracies caused by manual time adjustments on devices when determining a user's time zone in JavaScript and passing it to PHP for timestamp conversion, we can use the Internationalization API in JavaScript to get the user's time zone offset in minutes. This offset can then be sent to PHP, where it can be used to adjust the timestamp accordingly. 

<?php
// Get the time zone offset in minutes from JavaScript
$timezone_offset_minutes = $_POST['timezone_offset_minutes'];

// Adjust the timestamp using the time zone offset
$timestamp = time() + ($timezone_offset_minutes * 60);

echo $timestamp;
?>

Keywords

Javascript time zone PHP timestamp conversion inaccuracies

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