diff --git a/src/editcalendar.php b/src/editcalendar.php
new file mode 100644
index 0000000..ac0f8ca
--- /dev/null
+++ b/src/editcalendar.php
@@ -0,0 +1,78 @@
+<?php
+require_once("core.php");
+security::checkType(security::ADMIN);
+
+$mdHeaderRowBefore = visual::backBtn("calendars.php");
+
+if (!security::checkParams("GET", [
+  ["id", security::PARAM_NEMPTY]
+])) {
+  security::go("calendars.php");
+}
+
+$id = (int)$_GET["id"];
+
+$c = calendars::get($id);
+
+if ($c === false) {
+  security::go("calendars.php");
+}
+
+$details = json_decode($c["details"], true);
+
+if (json_last_error() !== JSON_ERROR_NONE) {
+  security::go("calendars.php?msg=unexpected");
+}
+
+$viewOnly = (isset($_GET["view"]) && $_GET["view"] == 1);
+?>
+<!DOCTYPE html>
+<html>
+<head>
+  <title><?php echo $conf["appName"]; ?></title>
+  <?php visual::includeHead(); ?>
+  <link rel="stylesheet" href="css/dashboard.css">
+  <link rel="stylesheet" href="css/calendar.css">
+</head>
+<?php visual::printBodyTag(); ?>
+  <div class="mdl-layout mdl-js-layout mdl-layout--fixed-header mdl-layout--fixed-drawer">
+    <?php visual::includeNav(); ?>
+    <main class="mdl-layout__content">
+      <div class="page-content">
+        <div class="main mdl-shadow--4dp">
+          <h2>Calendario de &ldquo;<?=security::htmlsafe($c["categoryname"])?>&rdquo;</h2>
+          <?php
+          $current = new DateTime();
+          $current->setTimestamp($c["begins"]);
+          $ends = new DateTime();
+          $ends->setTimestamp($c["ends"]);
+          ?>
+          <form action="doeditcalendar.php" method="POST">
+            <input type="hidden" name="id" value="<?=(int)$id?>">
+            <?php
+            calendarsView::renderCalendar($current, $ends, function ($timestamp, $id, $dow, $dom, $extra) {
+              return ($extra[$timestamp] == $id);
+            }, $viewOnly, $details);
+
+            if (!$viewOnly)  {
+              ?>
+              <button class="mdl-button mdl-js-button mdl-button--raised mdl-js-ripple-effect mdl-button--accent">Modificar</button>
+              <?php
+            }
+            ?>
+          </form>
+        </div>
+      </div>
+    </main>
+  </div>
+
+  <script src="js/calendar.js"></script>
+
+  <?php
+  visual::smartSnackbar([
+    ["inverted", "La fecha de inicio debe ser anterior a la fecha de fin."],
+    ["overlap", "El calendario que intentabas añadir se solapa con uno ya existente."]
+  ]);
+  ?>
+</body>
+</html>