PHP doesn't recognize PDT

Question

I'm just trying to print the current time in PDT

<?php
$date1 = new DateTime("now", new DateTimeZone('PDT') );
echo $date1->format('Y-m-d H:i:s e P')."\n";

$date2 = new DateTime("now", new DateTimeZone('PST') );
echo $date2->format('Y-m-d H:i:s e P')."\n";
?>

and I get

2022-05-03 14:59:33 PDT -08:00
2022-05-03 14:59:33 PST -08:00

Why is this happening and how do I get the right time? This is PHP 7.4

Edit: I know America/Los_Angeles works, but that's not the point. Background: get the system time zone from a database and get the current time of that time zone. Unless there's a way to convert PDT to America/Los_Angeles?

Answer 1

<?php
$date1 = new DateTime("now", new DateTimeZone('America/Los_Angeles') );
echo $date1->format('Y-m-d H:i:s e P')."\n";

$date2 = new DateTime("now", new DateTimeZone('America/Los_Angeles') );
echo $date2->format('Y-m-d H:i:s e P')."\n";

?>

Answer 2

<?php
// first set YOUR timezone or the Server timezone
date_default_timezone_set('America/Phoenix');

// set current time
$date1 = new DateTime();
echo $date1->format('Y-m-d H:i:s e P') . "\n";

// set new time zone
$newTimezone = new DateTimeZone('PST');

// change current Datetime to new timezone
$date1->setTimezone($newTimezone)

// show time
echo $date1->format('Y-m-d H:i:s e P')."\n";

// set new time zone
$newTimezone = new DateTimeZone('EST');

// change current Datetime to new timezone
$date1->setTimezone($newTimezone)

// show time
echo $date1->format('Y-m-d H:i:s e P')."\n";