Untitled

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>s</title>

  </head>
  <body>

<form action="" method="post">

Went to bed at<br>
<input type="time" name="time1"><br>
Woke up at:<br>
<input type="time" name="time2">
<input type="submit" >


</form>

<?php

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "db1";


$conn = new mysqli($servername, $username, $password, $dbname);

checkConnectivity($conn);

function checkConnectivity($conn){
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
}


ini_set('display_errors', 0);
$current_time = strtotime($_POST['time2']);
$old_time = strtotime($_POST['time1']);

$difference = $current_time -= $old_time;


echo "You slept for: " .
"<b>" .
number_format((float) abs($difference / 60 / 60 ), 2, '.', '') .
"</b>" .
" hours.";


$conn->query("INSERT INTO table1 (fell_asleep)
VALUES ('23')");

ini_set('display_errors', 1);


?>


</html>