php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #78758 DateTime format result is incorrect
Submitted: 2019-10-29 07:30 UTC Modified: 2019-10-29 07:57 UTC
From: checgg at gmail dot com Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 7.1.33 OS: Any
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: checgg at gmail dot com
New email:
PHP Version: OS:

 

 [2019-10-29 07:30 UTC] checgg at gmail dot com 
Description:
------------
var_dump(test('2019-10-27 08:55:00'));//result is 2019-10-27 02:55:00
var_dump(test('2019-10-27 09:55:00'));//result is also 2019-10-27 02:55:00

It`s incorrect.

Test script:
---------------
<?php
ini_set('date.timezone', 'Asia/Shanghai');

var_dump(test('2019-10-27 08:55:00'));//result is 2019-10-27 02:55:00
var_dump(test('2019-10-27 09:55:00'));//result is also 2019-10-27 02:55:00

function test($testDate)
{
    $format = 'Y-m-d H:i:s';
    $timezone = 'Europe/Paris';
    // if ($timezone == 'Europe/Paris') {
    //     return date($format, strtotime($testDate) - 7 * 3600);
    // }
    $date = new DateTime($testDate);
    $date->setTimezone(new DateTimeZone($timezone));
    return $date->format($format);
}


Expected result:
----------------
var_dump(test('2019-10-27 08:55:00'));//result is 2019-10-27 01:55:00
var_dump(test('2019-10-27 09:55:00'));//result is also 2019-10-27 02:55:00

It`s correct.

Actual result:
--------------
var_dump(test('2019-10-27 08:55:00'));//result is 2019-10-27 02:55:00
var_dump(test('2019-10-27 09:55:00'));//result is also 2019-10-27 02:55:00

It`s incorrect.

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2019-10-29 07:42 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2019-10-29 07:42 UTC] requinix@php.net 
https://3v4l.org/C1IJG
 [2019-10-29 07:54 UTC] checgg at gmail dot com 
What is the `I` means ?

the result is :
```
string(21) "2019-10-27 02:55:00 1"
string(21) "2019-10-27 02:55:00 0"
```
'2019-10-27 08:55:00' transfer to "2019-10-27 02:55:00" is incorrect.
correct result should be "2019-10-27 01:55:00" ?
 [2019-10-29 07:57 UTC] requinix@php.net 
https://www.php.net/date
> I (capital i)
> Whether or not the date is in daylight saving time
> 1 if Daylight Saving Time, 0 otherwise.

https://www.google.com/search?q=what+is+daylight+saving+time
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Thu Jul 17 00:01:31 2025 UTC