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• https://www.php.net/manual/en/datetime.settimezone.php
• https://www.php.net/manual/en/timezones.php
• https://www.php.net/manual/en/class.datetimezone.php
• Good Implementation for Object class: https://docs.oracle.com/javase/8/docs/api/java/util/Objects.html
  • https://stackoverflow.com/a/271874/1804013
• Variables::isNotNull() / Objects::isNotNull() => https://stackoverflow.com/a/397740/1804013

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If method parameter cannot properly execute basically a parameter is empty then NullPointerException should be thrown. This check happens at the beginning of the method.