update error

<?php
include '../koneksi.php';
include "kepala.php";
//print_r($_POST);
		if (isset($_POST["action"]) && $_POST["action"]=="update") {
		$simpan = myquery("UPDATE jadwal SET tgl_berangkat= '$_POST[tgl_berangkat]', id_tujuan='$_POST[id_tujuan]', tgl_berangkat= '$_POST[tgl_berangkat]', jam_berangkat= '$_POST[jam_berangkat]', markup= '$_POST[markup]' WHERE kd_jadwal = '$_POST[kd_jadwal]'");
		if ($simpan) {
		header('Location: jadwal.php');
		}else{
				echo "Gagal!";
			}
		}
$kd_jadwal = $_POST['kd_jadwal'];
$tampil = mysqli_fetch_array(myquery("SELECT * FROM jadwal WHERE kd_jadwal= '$kd_jadwal'"));
?>
 <div class="content">
            <div class="container-fluid">
                <div class="row">
                    <div class="col-md-6">
                        <div class="card">
							<h3 style="padding: 15px;">Tambah jadwal</h3>
							   <div class="content table-responsive table-full-width" style="padding: 1px 15px 10px 15px;">
								<div style="widht: 500px; border: 0px solid black; padding: 8px">
									<form action="editjadwal.php" method="POST" class="form1"
										style="
										  margin:0 auto;
										  background: rgb(241, 239, 226);
										  padding: 20px 30px;
										  border: 1px solid #D9D7D8;
										  border-radius: 5px;
										  box-shadow: 0px 1px 0px rgba(0,0,0,0.3),inset 0px 1px 0px rgba(255,255,255,0.04)
										  right: 0px;">
										<input type="hidden" name="kd_jadwal" value="<?php echo $tampil['kd_jadwal'];?>">
										<input type="hidden" name="action" value="update">
										<input type="text"required name="id_tujuan" value="<?php echo $tampil['id_tujuan'];?>" style="color:#151212;border-color: #ECB300;padding: 7px;font-size:15px">
										<input type="text" required name="id_bus" value="<?php echo $tampil['id_bus'];?>"style="color:#151212;border-color: #ECB300;padding: 7px;font-size:15px">
										<input type="text" required name="harga" value="<?php echo $tampil['harga'];?>" style="color:#151212;border-color: #ECB300;padding: 7px;font-size:15px">
										<input type="date" required name="tgl_berangkat" value="<?php echo $tampil['tgl_berangkat'];?>" style="color:#151212;border-color: #ECB300;padding: 7px;font-size:15px">

										<input type="text" required name="jam_berangkat" value="<?php echo $tampil['jam_berangkat'];?>"style="color:#151212;border-color: #ECB300;padding: 7px;font-size:15px">
										<button type="submit" class="glyphicon glyphicon-ok" name="simpan" style="width: 20%;margin-right: 0px;background-color:crgb(245, 187, 5);padding: 7px;font-size:15px">Save</button>

									</form>
								</div>
							</div>
						</div>
                    </div>
                </div>
            </div>
        </div>
<?php
include "../footer.php";
?>