Add times for the next day to own option group

This is because we want to remove the parentheses for future
changes where those should be used to display a time in another
timezone.

Author: jrauh01

application/forms/RotationConfigForm.php

@@ -802,9 +802,10 @@ protected function assemblePartialDayOptions(FieldsetElement $options): DateTime
         ]);
 
         $selectedFromTime = $from->getValue();
+        $nextDayTimeOptions = [];
         foreach ($timeOptions as $key => $value) {
-            unset($timeOptions[$key]); // unset to re-add it at the end of array
-            $timeOptions[$key] = sprintf('%s (%s)', $value, $this->translate('Next Day'));
+            unset($timeOptions[$key]);
+            $nextDayTimeOptions[$key] = $value;
 
             if ($selectedFromTime === $key) {
                 break;
@@ -813,7 +814,9 @@ protected function assemblePartialDayOptions(FieldsetElement $options): DateTime
 
         $to = $options->createElement('select', 'to', [
             'required' => true,
-            'options' => $timeOptions
+            'options' => empty($timeOptions)
+                ? ['Next Day' => $nextDayTimeOptions]
+                : ['Today' => $timeOptions, 'Next Day' => $nextDayTimeOptions]
         ]);
         $options->registerElement($to);