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Bug #81093 different time give same date
Submitted: 2021-05-31 22:01 UTC Modified: 2021-05-31 22:12 UTC
From: sylvain dot rochette at gmail dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: Irrelevant OS: linux
Private report: No CVE-ID: None
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 [2021-05-31 22:01 UTC] sylvain dot rochette at gmail dot com 
Description:
------------
php5.7, i cannot use a recent version but I think this issue is still there

The problem that I don't understand is a date come 2 times, with different time value. EXACT SAME TIME for about 1h in total

The example I give start at 

2020-11-01 00:45:00 1604205900
2020-11-01 00:50:00 1604206200
2020-11-01 00:55:00 1604206500
2020-11-01 01:00:00 1604206800

but after few 5 min jump (300)

it return back to 

2020-11-01 01:00:00 1604210400

even if the time is different, I just don't understand, if you continue it will get to 2 hours and it's fine but just this sequence does not work.

I try the first 11 months without any issue until I get to this date!!

The only thing I see is they are big number but still it continue fine, The thing is, php seam to have a bug (hardcoded) related to this date, I say PHP it's maybe linux, I just don't understand it...

My concern is date >= then 1604210400 are all BAD...

Please help me to understand the issue I am stuck with that lol, a bug from date("Y-m-d H:i:s", $i)??? 

Test script:
---------------
for ($i = 1604205900; $i <= 1604211000; $i += 300) {
    $time = date("Y-m-d H:i:s", $i);
    echo ($time."    ".$i."<BR/>");
}

Expected result:
----------------
2020-11-01 00:45:00 1604205900
2020-11-01 00:50:00 1604206200
2020-11-01 00:55:00 1604206500
2020-11-01 01:00:00 1604206800
2020-11-01 01:05:00 1604207100
2020-11-01 01:10:00 1604207400
2020-11-01 01:15:00 1604207700
2020-11-01 01:20:00 1604208000
2020-11-01 01:25:00 1604208300
2020-11-01 01:30:00 1604208600
2020-11-01 01:35:00 1604208900
2020-11-01 01:40:00 1604209200
2020-11-01 01:45:00 1604209500
2020-11-01 01:50:00 1604209800
2020-11-01 01:55:00 1604210100

2020-11-01 02:00:00 1604210400
2020-11-01 02:05:00 1604210700
2020-11-01 02:10:00 1604211000

Actual result:
--------------
2020-11-01 00:45:00 1604205900
2020-11-01 00:50:00 1604206200
2020-11-01 00:55:00 1604206500
2020-11-01 01:00:00 1604206800
2020-11-01 01:05:00 1604207100
2020-11-01 01:10:00 1604207400
2020-11-01 01:15:00 1604207700
2020-11-01 01:20:00 1604208000
2020-11-01 01:25:00 1604208300
2020-11-01 01:30:00 1604208600
2020-11-01 01:35:00 1604208900
2020-11-01 01:40:00 1604209200
2020-11-01 01:45:00 1604209500
2020-11-01 01:50:00 1604209800
2020-11-01 01:55:00 1604210100

2020-11-01 01:00:00 1604210400
2020-11-01 01:05:00 1604210700
2020-11-01 01:10:00 1604211000

Patches

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 [2021-05-31 22:03 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2021-05-31 22:03 UTC] requinix@php.net 
We are happy to tell you that you just discovered Daylight Savings
Time. For more information see:
http://webexhibits.org/daylightsaving/b.html
Instead of using mktime/date consider using gmmktime and gmdate which do
not suffer from DST.
 [2021-05-31 22:12 UTC] sylvain dot rochette at gmail dot com 
I try the sandbox and it work, it seam my 5.6.35 php is buggy on my domain. Not quite sure of the issue...
 [2021-05-31 22:14 UTC] sylvain dot rochette at gmail dot com 
the sandbox show different date compare to what I get, few hours decay it is really wierd, I get that on the sandbox

2020-10-31 21:45:00    1604205900
2020-10-31 21:50:00    1604206200
2020-10-31 21:55:00    1604206500
2020-10-31 22:00:00    1604206800
2020-10-31 22:05:00    1604207100
2020-10-31 22:10:00    1604207400
2020-10-31 22:15:00    1604207700
2020-10-31 22:20:00    1604208000
2020-10-31 22:25:00    1604208300
2020-10-31 22:30:00    1604208600
2020-10-31 22:35:00    1604208900
2020-10-31 22:40:00    1604209200
2020-10-31 22:45:00    1604209500
2020-10-31 22:50:00    1604209800
2020-10-31 22:55:00    1604210100
2020-10-31 23:00:00    1604210400
2020-10-31 23:05:00    1604210700
2020-10-31 23:10:00    1604211000
 [2021-06-01 02:46 UTC] a at b dot c dot de 
Presumably the sandbox you're talking about is running in a different timezone than the you're using (one three hours to the west). See requinix's comment about Daylight Saving.
 
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