时区与碳的区别

Question

Time in CEST = UTC time+2h but my code showing only 1h and I don't know why... (you can test it here )

require 'Carbon/Carbon.php';
use Carbon\Carbon;

$timestamp = '2018-04-06 14:30:00';
$date = Carbon::createFromFormat('Y-m-d H:i:s', $timestamp, 'UTC');
var_dump($date);
//{ ["date"]=> string(26) "2018-04-06 14:30:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } 
$date->tz('CEST');
var_dump($date);
//{ ["date"]=> string(26) "2018-04-06 15:30:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(4) "CEST" }

Answer 1

The issue is that CEST is not a supported timezone in PHP, and can therefore exhibit "undefined behaviour". I suspect it's being interpreted as CET, which is UTC+1.

If you use a specific geographical identifier instead, such as Europe/Berlin, it should present the correct result (i.e. +2 hours from UTC). Try:

$date->tz('Europe/Berlin');

See https://3v4l.org/c4lve