fix: emit export pickup times as clock readings without an offset

src/Service/ProductExportBuilder.php

@@ -193,6 +193,10 @@ class ProductExportBuilder
      * getPickups() resolves both zeit shapes and rolls a bare time past midnight onto the
      * next day. Entries with id 0 are kept: the consumer drops them itself.
      *
+     * `datetime` is BusPro's clock reading, without an offset. Resolving in Europe/Berlin
+     * would move a bare 02:45 on the spring-forward night to 03:45, so the dates are
+     * resolved in UTC, where no time is skipped or repeated.
+     *
      * @param array<int|string, Pickup> $masterData
      * @param array<int, true>          $pickupsWithoutMasterData
      *
@@ -201,8 +205,9 @@ class ProductExportBuilder
     private function buildPickups(Crawler $dateNode, \DateTimeImmutable $dateFrom, array $masterData, array &$pickupsWithoutMasterData): array
     {
         $resolved = [];
+        $clockDate = new \DateTimeImmutable($dateFrom->format('Y-m-d'), new \DateTimeZone('UTC'));
 
-        foreach ($this->travelParser->getPickups($this->productExportParser->children($dateNode, 'zustiege/zustieg'), $dateFrom, true) as $pickup) {
+        foreach ($this->travelParser->getPickups($this->productExportParser->children($dateNode, 'zustiege/zustieg'), $clockDate, true) as $pickup) {
             $pickupId = (int) $pickup->id;
             $details = $masterData[$pickupId] ?? null;
 
@@ -216,7 +221,7 @@ class ProductExportBuilder
                 'city' => $details?->city,
                 'street' => $details?->street,
                 'price' => $pickup->price,
-                'datetime' => $pickup->time?->format('c'),
+                'datetime' => $pickup->time?->format('Y-m-d\TH:i:s'),
             ];
         }