setToPreviousWeek($_POST["prevweek"]);
} elseif (isset($_POST["book"])) {
    createBooking($_POST["book"], $conn);
} elseif (isset($_POST["undo"])) {
    deleteBooking($_POST["undo"], $conn);
} else {
    setToCurrentWeek();
}
// else
// Establish the date of each day, store in individual variables
$mondate = $_SESSION["mondate"];
// calculate whole week
$tuedate = findNextDate($mondate);
$weddate = findNextDate($tuedate);
$thudate = findNextDate($weddate);
$fridate = findNextDate($thudate);
?>
  <!-- Form used to change to previous or next week
  Set values to current mondate, so that next mondate
  Can be set as +1 week (or -1 week for previous)-->
  <center>
  <h3>CLIP</h3><br>
  <form method="POST" action='slt_clip.php'>
    <button type='submit' id="prevweek" name="prevweek" <?php 
echo "value='" . $_SESSION['mondate'] . "'";
?>
>Previous Week</button>
    <b>Week of <?php 
echo styleWeekOf();
?>
</b>

function writeTable($conn, $table)
{
    ?>
      <form method="POST" action="/createrecurring_test.php">
        <button type='submit' id="prevweek" name="prevweek" <?php 
    echo "value='" . $_SESSION['mondate'] . "'";
    ?>
>Previous Week</button>
        <b>Week of <?php 
    echo styleWeekOf();
    ?>
</b>
        <button type='submit' id="nextweek" name="nextweek"<?php 
    echo "value='" . $_SESSION['mondate'] . "'";
    ?>
>Next Week</button><br>
        <button type='submit' id="currentweek" name="currentweek"<?php 
    echo "value='" . $_SESSION['mondate'] . "'";
    ?>
>Current Week</button><br>
      </form>
      <table class="calendar">
      <tr>
      <!-- Write table headers -->
        <th></th>
        <?php 
    // Establish the date of each day, store in individual variables
    $mondate = $_SESSION["mondate"];
    // calculate whole week
    $tuedate = findNextDate($mondate);
    $weddate = findNextDate($tuedate);
    $thudate = findNextDate($weddate);
    $fridate = findNextDate($thudate);
    // Monday
    echo "<th>";
    if (checkIfToday($mondate)) {
        echo "<u>";
    }
    // if
    echo "Monday";
    echo "<br>" . styleDate($mondate) . "</u></th>";
    // Tuesday
    echo "<th>";
    if (checkIfToday($tuedate)) {
        echo "<u>";
    }
    // if
    echo "Tuesday";
    echo "<br>" . styleDate($tuedate) . "</u></th>";
    // Wednesday
    echo "<th>";
    if (checkIfToday($weddate)) {
        echo "<u>";
    }
    // if
    echo "Wednesday";
    echo "<br>" . styleDate($weddate) . "</u></th>";
    // Thursday
    echo "<th>";
    if (checkIfToday($thudate)) {
        echo "<u>";
    }
    // if
    echo "Thursday";
    echo "<br>" . styleDate($thudate) . "</u></th>";
    // Friday
    echo "<th>";
    if (checkIfToday($fridate)) {
        echo "<u>";
    }
    // if
    echo "Friday";
    echo "<br>" . styleDate($fridate) . "</u></th>";
    ?>
      </tr>
      <tr>
        <!--PERIOD 1-6-->
        <?php 
    for ($period = 1; $period <= 8; $period++) {
        echo "<tr>";
        echo "<th>Period {$period}</th>";
        writeCell($conn, $table, $mondate, $period);
        writeCell($conn, $table, $tuedate, $period);
        writeCell($conn, $table, $weddate, $period);
        writeCell($conn, $table, $thudate, $period);
        writeCell($conn, $table, $fridate, $period);
        echo "</tr>";
    }
    // for
    ?>
      </table>
      <?php 
}