@m-usman,
Yes, you can use datetime in x-axis. In order to use datetime in x-axis, you need to first convert PHP date to timestamp using strtotime and then convert PHP timestamp to JavaScript timestamp by multiplying it with 1000.
$phpDate = date("Y-m-d h:i:sa");
$phpTimestamp = strtotime($phpDate);
$javaScriptTimestamp = $phpTimestamp * 1000;
You can refer to this thread for more information on using datetime on x-axis in PHP. Also, you can check out this gallery page for an example on using JavaScript timestamp in x-axis in PHP.
—-
Manoj Mohan
Team CanvasJS