Switch to new dated email format

site/plugins/dated/index.php

@@ -0,0 +1,46 @@
+<?php
+
+use Kirby\Http\Url;
+use Kirby\Toolkit\F;
+
+Kirby::plugin('lukasbestle/dated', [
+    'tags' => [
+        'dated' => [
+            'html' => function($tag) {
+                $dated = dated();
+                return '<a href="mailto:' . $dated . '">' . $dated . '</a>';
+            }
+        ]
+    ]
+]);
+
+/**
+ * Returns the current dated address
+ *
+ * @return string
+ */
+function dated(): string {
+    // date in seven days
+    $date = modifiedJulianDate(time() + 7 * 24 * 60 * 60);
+
+    return 'dated-' . $date . '@' . Url::host();
+}
+
+/**
+ * Returns the Modified Julian Date,
+ * which is the Julian Date with the first two digits stripped
+ * and with an offset of one day to compensate for the Julian Date
+ * starting at noon instead of at midnight
+ *
+ * @param int $timestamp Timestamp to calculate from, defaults to the current date
+ * @return int
+ */
+function modifiedJulianDate(?int $timestamp = null): int {
+    $timestamp = $timestamp ?? time();
+
+    return gregoriantojd(
+        date('m', $timestamp),
+        date('d', $timestamp),
+        date('Y', $timestamp)
+    ) - 2400001;
+}

site/plugins/qdated/index.php

@@ -1,29 +0,0 @@
-<?php
-
-use Kirby\Http\Url;
-use Kirby\Toolkit\F;
-
-Kirby::plugin('lukasbestle/qdated', [
-    'tags' => [
-        'qdated' => [
-            'html' => function($tag) {
-                $qdated = qdated($tag->qdated);
-                return '<a href="mailto:' . $qdated . '">' . $qdated . '</a>';
-            }
-        ]
-    ]
-]);
-
-/**
- * Returns the current qdated address
- * If qdated is not available, returns null
- *
- * @param string $destination
- * @return string
- */
-function qdated(string $destination) {
-    $path = $_SERVER['HOME'] . '/.config/qdated/' . $destination . '/current';
-    if(!is_file($path)) return null;
-
-    return 'dated-' . trim(F::read($path)) . '@' . Url::host();
-}