Fix flyout weekday

If the entries shift to another weekday in the display timezone the
flyouts have to point this out. For that we shift the days array
for **partial** mode rotations or the start and end days for
**multi** mode rotations.

Author: jrauh01

library/Notifications/Widget/Timeline/EntryFlyout.php

@@ -233,6 +233,42 @@ public function assemble(): void
         );
     }
 
+    /**
+     * Shift the weekday if the entry starts on an earlier or later weekday in the display timezone
+     *
+     * @param int $day
+     * @param int $shift
+     *
+     * @return int
+     */
+    protected function shiftDay(int $day, int $shift): int
+    {
+        return ((($day - 1 + $shift) % 7) + 7) % 7 + 1;
+    }
+
+    /**
+     * Shift the whole weekdays array if the entries start on an earlier or later weekday in the display timezone
+     *
+     * @param array $days
+     * @param int   $shift
+     *
+     * @return array
+     */
+    protected function shiftDays(array $days, int $shift): array
+    {
+        if ($shift === 0) {
+            return $days;
+        }
+
+        $out = [];
+        foreach ($days as $d) {
+            $out[] = $this->shiftDay($d, $shift);
+        }
+        sort($out);
+
+        return $out;
+    }
+
     /**
      * Generate and save the part of the entry flyout, that remains equal for all entries of the rotation
      *
@@ -265,11 +301,14 @@ protected function generateAndSetRotationInfo(): static
         };
         $timeFormatter = new \IntlDateFormatter(\Locale::getDefault(), $noneType, $shortType, $displayTimezone);
         $dateFormatter = new \IntlDateFormatter(\Locale::getDefault(), $shortType, $noneType, $displayTimezone);
-        $firstHandoff = $dateFormatter->format(DateTime::createFromFormat(
-            'Y-m-d H:i',
-            $this->firstHandoff . ' ' . $time,
-            $scheduleTimezone
-        ));
+
+        $firstHandoffDt = DateTime::createFromFormat('Y-m-d H:i', $this->firstHandoff . ' ' . $time, $scheduleTimezone);
+        $scheduleDt = (clone $firstHandoffDt)->setTime(0, 0);
+        $displayDt = (clone $firstHandoffDt)->setTimezone($displayTimezone)->setTime(0, 0);
+
+        $shift = $displayDt <=> $scheduleDt;
+
+        $firstHandoff = $dateFormatter->format($firstHandoffDt);
 
         if (($this->rotationOptions['frequency'] ?? null) === 'd') {
             $handoff = sprintf(
@@ -318,7 +357,7 @@ protected function generateAndSetRotationInfo(): static
         );
 
         if ($this->mode === "partial") {
-            $days = $this->rotationOptions["days"];
+            $days = $this->shiftDays($this->rotationOptions["days"], $shift);
             $from = $timeFormatter->format(DateTime::createFromFormat(
                 'H:i',
                 $this->rotationOptions["from"],
@@ -356,13 +395,13 @@ protected function generateAndSetRotationInfo(): static
                 )
             )->addHtml($firstHandoffInfo);
         } elseif ($this->mode === "multi") {
-            $fromDay = $weekdayNames[$this->rotationOptions["from_day"]];
+            $fromDay = $weekdayNames[$this->shiftDay($this->rotationOptions["from_day"], $shift)];
             $fromAt = $timeFormatter->format(DateTime::createFromFormat(
                 'H:i',
                 $this->rotationOptions["from_at"],
                 $scheduleTimezone
             ));
-            $toDay = $weekdayNames[$this->rotationOptions["to_day"]];
+            $toDay = $weekdayNames[$this->shiftDay($this->rotationOptions["to_day"], $shift)];
             $toAt = $timeFormatter->format(DateTime::createFromFormat(
                 'H:i',
                 $this->rotationOptions["to_at"],