Php default timezone

date_default_timezone_set("Asia/Kolkata");
// List of Supported Timezones https://www.php.net/manual/en/timezones.php

Source: php.net

Php datetime set timezone

$date = new \DateTime();
$date->setTimezone(new \DateTimeZone('+0800')); //GMT
echo $date->format('Y-m-d H:i:s');
// 2020-11-20 15:23:49

echo date_default_timezone_get(); //UTC

//Read more at https://www.php.net/manual/en/function.date-default-timezone-get.php

Source: php.net

date_default_timezone_set('Asia/Kolkata);

date_default_timezone_set("Asia/Ho_Chi_Minh");
echo(date('Y-m-d H:i:s');)

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