https://api.drupal.org/api/drupal/core%21modules%21serialization%21src%21Normalizer%21DateTimeIso8601Normalizer.php/property/DateTimeIso8601Normalizer%3A%3AallowedFormats/10
DateTimeIso8601Normalizer::$allowedFormats | Drupal API
drupalapi
https://developers-dot-devsite-v2-prod.appspot.com/ad-manager/api/reference/v202602/LineItemService.AllowedFormats
enum AllowedFormats (v202602) | Ad Manager SOAP API | Google for Developers
ad managersoap apienumgoogledevelopers
https://developers-dot-devsite-v2-prod.appspot.com/ad-manager/api/reference/v202602/ForecastService.AllowedFormats
enum AllowedFormats (v202602) | Ad Manager SOAP API | Google for Developers
ad managersoap apienumgoogledevelopers