second commit

src/helpers.php

@@ -122,3 +122,56 @@ function encode_payload(array $payload): string
     return base64_encode((string) json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
 }
 
+function shift_date(string $date, int $days): string
+{
+    $current = DateTimeImmutable::createFromFormat('Y-m-d', $date);
+
+    if ($current === false) {
+        return today();
+    }
+
+    return $current->modify(($days >= 0 ? '+' : '') . $days . ' day')->format('Y-m-d');
+}
+
+function format_display_date(string $date, bool $withWeekday = true): string
+{
+    $current = DateTimeImmutable::createFromFormat('Y-m-d', $date);
+
+    if ($current === false) {
+        return $date;
+    }
+
+    $weekdays = ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'];
+    $months = [
+        1 => 'Januar',
+        2 => 'Februar',
+        3 => 'März',
+        4 => 'April',
+        5 => 'Mai',
+        6 => 'Juni',
+        7 => 'Juli',
+        8 => 'August',
+        9 => 'September',
+        10 => 'Oktober',
+        11 => 'November',
+        12 => 'Dezember',
+    ];
+
+    $label = $current->format('j.') . ' ' . $months[(int) $current->format('n')] . ' ' . $current->format('Y');
+
+    if (!$withWeekday) {
+        return $label;
+    }
+
+    return $weekdays[(int) $current->format('w')] . ', ' . $label;
+}
+
+function icon_path(string $name): string
+{
+    return '/assets/icons/' . $name . '.svg';
+}
+
+function mood_icon_path(string $sentiment): string
+{
+    return icon_path('mood-' . $sentiment);
+}