$sql = "INSERT INTO availability (day,hour)
    VALUES ('$date1','9am');";
    $sql = "INSERT INTO availability (day,hour)
    VALUES ('$date1','10am');";
    $sql = "INSERT INTO availability (day,hour)
    VALUES ('$date1','11am');";

$date1 = date('Y-m-d', strtotime('next saturday', strtotime($givenDate)));
$date2 = date('Y-m-d', strtotime('Next sunday', strtotime($givenDate)));

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

    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }

    $sql = "INSERT INTO availability (day,hour)
    VALUES ('$date1','9am');";
    $sql = "INSERT INTO availability (day,hour)
    VALUES ('$date1','10am');";
    $sql = "INSERT INTO availability (day,hour)
    VALUES ('$date1','11am');";

    $sql .= "INSERT INTO availability (day,hour)
    VALUES ('$date2','');";


    if ($conn->multi_query($sql) === TRUE) {
        echo "New records created successfully";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }

    $conn->close();
    }