Backward incompatibility on date function 8.1+

[eerison]

Description

The following code:

https://3v4l.org/aMChK

<?php

var_dump(date('y-m-d H:i:s', '2222222222'));

Resulted in this output:

string(17) "40-06-02 05:57:02"

But I expected this output instead:

string(17) "40-06-02 04:57:02"

Hello guys on date function contains a backward incompatibility after 8.1+

PHP Version

PHP 8.1+

Operating System

No response

[SakiTakamachi]

Probably the following bug is involved:
https://bugs.php.net/bug.php?id=69806

So in this case, 05:57:02 is correct.

(edit)
This has been fixed in 8.1.

[eerison]

https://3v4l.org/aMChK

Yep that is right!

I tested

ini_set('date.timezone', 'Europe/Berlin');

echo date('Y-m-d H:i:s', 2377224000);

https://3v4l.org/kCjvL

and it returned the same value as https://www.unixtimestamp.com/, then that is correct, on 8.0 was a bug ;)

thank you for clarify.

[eerison]

Hello @SakiTakamachi

I just did some others tests and I noticed some others behaviours for years since 2038+.

for years before 2038, it works with without any backward incompatibility, but since 2038, it has different output.

for example:

2377224000 (2045) 🔴 
2156300876 (2038) 🔴 
2124766039 (2037) 🟢 

I used the same code:

<?php

 ini_set('date.timezone', 'Europe/Berlin');

echo date('Y-m-d H:i:s', 2124766039);

IMO it shouldn't happen, should it?

[SakiTakamachi]

@eerison

The previous bug was likely only to occur after 2038.

Could you please show us the output for each of the three timestamps you mentioned?

[eerison]

Hey @SakiTakamachi

now the issue is clear , it is related with timezone!

after I add T on the end, I realised that after 2038 it was getting the wrong timezone.

e.g:

<?php

//   ini_set('date.timezone', 'Europe/Berlin');
  ini_set('date.timezone', 'America/New_York');



echo date('Y-m-d H:i:s T', 2156300876);

8.1+ 2038-05-01 00:27:56 EDT
8.0- 2038-04-30 23:27:56 EST

and the correct is EDT, then it is definitely fixing an issue 😄

sorry for the confusion, But now it is clear ❤️