Fix the timezone validator

Due to the new format we should check for different zones. We now either
check for the timezones or for the offset as technically those are the
same timezone but the idea was to require consistency.

Author: vmcj

webapp/src/Controller/Jury/ContestController.php

@@ -956,9 +956,22 @@ private function checkTimezones(FormInterface $form): ?Response
         foreach (['Activate', 'Deactivate', 'Start', 'End', 'Freeze', 'Unfreeze'] as $timeString) {
             $tmpValue = $formData->{'get' . $timeString . 'timeString'}();
             if ($tmpValue !== '' && !is_null($tmpValue)) {
-                $fields = explode(' ', $tmpValue);
-                if (count($fields) > 1) {
-                    $timeZones[] = $fields[2];
+                if (preg_match("/\d{2}-\d{2}-\d{2}.*/", $tmpValue) === 1) {
+                    $chr = $tmpValue[10]; // The separator between date & time
+                    $fields = explode($chr, $tmpValue);
+                    // First field is the time, 2nd/3th might be timezone or offset
+                    $tmpValue = substr(str_replace($fields[0], '', $tmpValue), 1); // Also remove the separator
+                    if (str_contains($tmpValue, ' ')) {
+                        $fields = explode(' ', $tmpValue);
+                    } elseif (str_contains($tmpValue, '+')) {
+                        $fields = explode('+', $tmpValue);
+                    } elseif (substr($tmpValue, -1) === 'Z') {
+                        $timeZones[] = 'UTC';
+                        continue;
+                    }
+                    if (count($fields) > 1) {
+                        $timeZones[] = $fields[1];
+                    }
                 }
             }
         }