Symfony Form Choise Type Timezone

timezone.php

<?php

$builder
  ->add('cargoLRDTimezone', ChoiceType::class, [
      'label' => "Cargo LRD",
      'placeholder' => "Seçiniz..",
      'choices' => [
          'CST' => "CST (Central Standard Time)",
          'CET' => "CET (Central European Time)",
          'CEST' => "CEST (Central European Summer Time)",
          'CDT' => "CDT (Central Daylight Time)",
          'EST' => "EST (Eastern Standard Time)",
          'EET' => "EET (Eastern European Time)",
          'EEST' => "EEST (Eastern European Summer Time)",
          'EDT' => "EDT (Eastern Daylight Time)",
          'GMT' => "GMT (Greenwich Mean Time)",
          'PST' => "PST (Pacific Standard Time)",
          'PDT' => "PDT (Pacific Daylight Time)",
          'IST' => "IST (India Standard Time)",
          'BST' => "BST (British Summer Time)",
          'SAST' => "SAST (South Africa Standard Time)",
          'WAT' => "WAT (West Africa Time)",
          'WAST' => "WAST (West Africa Summer Time)",
          'WET' => "WET (Western European Time)",
          'WEST' => "EAST (Western European Summer Time)",
          'CAT' => "CAT (Central Africa Time)",
          'EAT' => "EAT (Eastern Africa Time)"
  
      ],
      'attr' => [
          'class' => "form-control selectpicker"
      ]
  ]);