valid time in 24 hours format with no seconds

my textboxes have same name and id with array

i am alerting the text box value onblur.It shows only the first text box value

I want to alert for every text box if value is not a number

Code:
	<?php
	session_start();
	if (!$_SESSION['uname']) header("Location:login.php"); ?>
	<html><head><title>Attendance
...