First get time zone from browser - then convert using the gmdate function in php to get the date...
i.e.
<?php
if (isset($_GET['offset'])) {
$minutes = $_GET['offset'];
echo "GMT offset (in minutes, from the browser): ". $minutes ."<br />\n";
echo "GMT: ". gmdate("Y-m-d H:i:s") ."<br />\n";
$local = gmmktime(gmdate("H"),gmdate("i")-$minutes); // adjust GMT by client's offset
echo "Calculated client's date/time: ". gmdate("Y-m-d h:i:s a",$local) ."<br />\n";
} else {
echo "<script language='javascript'>\n";
echo "var d = new Date();\n";
echo "location.href=\"${_SERVER['SCRIPT_NAME']}?offset=\" + d.getTimezoneOffset();\n";
echo "</script>\n";
exit();
}
?>
Now then that just was a script to echo out the offset... set 'em to variables then just use the date function to figure out the day of week..
// let's say they're in the timezone GMT+10
$theirOffset = 10; // $_GET['offset'] perhaps?
$offsetSeconds = $theirOffset * 3600;
echo gmdate("l", time() + $offsetSeconds);
datetime - How to find day of week in php - Stack Overflow
