Allow for the Z shorthand for UTC

Author: vmcj

webapp/src/Validator/Constraints/TimeStringValidator.php

@@ -11,7 +11,7 @@ class TimeStringValidator extends ConstraintValidator
     public function validate(mixed $value, Constraint $constraint): void
     {
         $timezoneRegex = "[A-Za-z][A-Za-z0-9_\/+-]{1,35}"; # See: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
-        $absoluteRegex = "\d\d\d\d-\d\d-\d\d( |T)\d\d:\d\d:\d\d(\.\d{1,6})? " . $timezoneRegex;
+        $absoluteRegex = "\d\d\d\d-\d\d-\d\d( |T)\d\d:\d\d:\d\d(\.\d{1,6})?( " . $timezoneRegex . "|Z)";
         $relativeRegex = "\d+:\d\d(:\d\d(\.\d{1,6})?)?";
         if (!$constraint instanceof TimeString) {
             throw new UnexpectedTypeException($constraint, TimeString::class);

webapp/tests/Unit/Controller/Jury/ContestControllerTest.php

@@ -49,6 +49,14 @@ class ContestControllerTest extends JuryControllerTestCase
                                                            'silverMedals'             => '1',
                                                            'bronzeMedals'             => '1',
                                                            'medalCategories'          => ['0' => '2']],
+                                                          ['shortname'            => 'utc_Z',
+                                                           'name'                 => 'UTC (Z)',
+                                                           'activatetimeString'   => '2021-07-17 16:08:00Z',
+                                                           'starttimeString'      => '2021-07-17 16:09:00.0Z',
+                                                           'freezetimeString'     => '2021-07-17 16:10:00.00Z',
+                                                           'endtimeString'        => '2021-07-17 16:11:00.000Z',
+                                                           'unfreezetimeString'   => '2021-07-17T16:12:00.1Z',
+                                                           'deactivatetimeString' => '2021-07-17T16:13:00.2Z'],
                                                           ['shortname'            => 'otzcet',
                                                            'name'                 => 'Other timezone (CET)',
                                                            'activatetimeString'   => '2021-07-17 16:08:00 CET',