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Bug #48245 Setting file datetime outside of matching DST settings loses time.
Submitted: 2009-05-12 14:30 UTC Modified: 2009-06-18 15:23 UTC
From: RQuadling at GMail dot com Assigned:
Status: Not a bug Package: Filesystem function related
PHP Version: 5.3CVS-2009-05-12 (snap) OS: Windows XP SP3
Private report: No CVE-ID: None
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From: RQuadling at GMail dot com
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 [2009-05-12 14:30 UTC] RQuadling at GMail dot com 
Description:
------------
Touching a file with a non DST datetime and then reading it back is 
losing 1 hour.

Using Procmon, Windows is getting and returning the correct times.

It seems that PHP is adjusting the times it gets when in DST and 
reading a file NOT in DST.





Reproduce code:
---------------
<?php
// Create a dummy file.
$s_File = getenv('TEMP') . DIRECTORY_SEPARATOR . 'junktime.txt';
file_put_contents($s_File, 'JUNK');

$a_Dates = array(
  'Some time today' => strtotime('today 13:14:15'),
  'January 1st'     => strtotime('2009/02/03 04:05:06'),
  'October 1st'     => strtotime('2008/10/01 04:05:06'),
);

foreach($a_Dates as $s_When => $dt_Date) {
  touch($s_File, $dt_Date);
  clearstatcache();
  $dt_Modified = filemtime($s_File);

  echo
    'Wanted to set the date to : (', $dt_Date, ') ', date('r', $dt_Date), PHP_EOL,
    'File was set to           : (', $dt_Modified, ') ', date('r', $dt_Modified), PHP_EOL,
    ($dt_Date === $dt_Modified ? 'Match' : 'Different'), PHP_EOL, PHP_EOL;
}

// Clean-up
unlink($s_File);

Expected result:
----------------
Wanted to set the date to : (1242130455) Tue, 12 May 2009 13:14:15 
+0100
File was set to           : (1242130455) Tue, 12 May 2009 13:14:15 
+0100
Match

Wanted to set the date to : (1233633906) Tue, 03 Feb 2009 04:05:06 
+0000
File was set to           : (1233633906) Tue, 03 Feb 2009 04:05:06 
+0000
Match

Wanted to set the date to : (1222830306) Wed, 01 Oct 2008 04:05:06 
+0100
File was set to           : (1222830306) Wed, 01 Oct 2008 04:05:06 
+0100
Match

Actual result:
--------------
Wanted to set the date to : (1242130455) Tue, 12 May 2009 13:14:15 
+0100
File was set to           : (1242130455) Tue, 12 May 2009 13:14:15 
+0100
Match

Wanted to set the date to : (1233633906) Tue, 03 Feb 2009 04:05:06 
+0000
File was set to           : (1233630306) Tue, 03 Feb 2009 03:05:06 
+0000
Different

Wanted to set the date to : (1222830306) Wed, 01 Oct 2008 04:05:06 
+0100
File was set to           : (1222830306) Wed, 01 Oct 2008 04:05:06 
+0100
Match

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 [2009-05-13 08:28 UTC] RQuadling at GMail dot com 
No difference...

>php -n -f z:\testDST.php
PHP V5.2.10-dev OS:WINNT SAPI:cli
Loaded INI:

Wanted to set the date to : (1242216855) 1 Wed, 13 May 2009 13:14:15 
+0100
File was set to           : (1242216855) 1 Wed, 13 May 2009 13:14:15 
+0100
Match

Wanted to set the date to : (1233633906) 0 Tue, 03 Feb 2009 04:05:06 
+0000
File was set to           : (1233630306) 0 Tue, 03 Feb 2009 03:05:06 
+0000
Different

Wanted to set the date to : (1222830306) 1 Wed, 01 Oct 2008 04:05:06 
+0100
File was set to           : (1222830306) 1 Wed, 01 Oct 2008 04:05:06 
+0100
Match

and

PHP V5.3.0RC3-dev OS:WINNT SAPI:cli
Loaded INI:D:\PHP\INI\php-cli.ini

Wanted to set the date to : (1242216855) 1 Wed, 13 May 2009 13:14:15 
+0100
File was set to           : (1242216855) 1 Wed, 13 May 2009 13:14:15 
+0100
Match

Wanted to set the date to : (1233633906) 0 Tue, 03 Feb 2009 04:05:06 
+0000
File was set to           : (1233630306) 0 Tue, 03 Feb 2009 03:05:06 
+0000
Different

Wanted to set the date to : (1222830306) 1 Wed, 01 Oct 2008 04:05:06 
+0100
File was set to           : (1222830306) 1 Wed, 01 Oct 2008 04:05:06 
+0100
Match


With the latest 5.2 and 5.3 snapshots.
 [2009-05-13 08:30 UTC] RQuadling at GMail dot com 
If I use the -n option for V5.3 to not use my INI file, I get the 
normal notice regarding a lack of timezone settings ...

"It is not safe to rely on the system's timezone settings. You are 
*required* to use the date.timezone setting or the 
date_default_timezone_set() function. In case you used any of
 those methods and you are still getting this warning, you most 
likely misspelled the timezone identifier. We selected 
'Europe/London' for '1.0/DST'"

date

date/time support => enabled
"Olson" Timezone Database Version => 2009.7
Timezone Database => internal
Default timezone => Europe/London

Directive => Local Value => Master Value
date.default_latitude => 50.3870 => 50.3870
date.default_longitude => -3.9520 => -3.9520
date.sunrise_zenith => 90.583333 => 90.583333
date.sunset_zenith => 90.583333 => 90.583333
date.timezone => Europe/London => Europe/London
 [2009-06-10 13:04 UTC] jani@php.net 
Just checking: Are the dates correct in the files when you check them 
without PHP? (like dir something..dunno, *nix has 'ls -l' :)
 [2009-06-10 14:00 UTC] RQuadling at GMail dot com 
Oh darn.

At the command prompt I created a new plain text file.
I then used Cygwin's touch ...

touch RAQ.txt -t 200901011213.14

then ...

dir RAQ.txt

which outputs ...

01/01/2009  13:13                27 RAQ.txt

Which is wrong. 

But having just read 
http://www.codeproject.com/KB/datetime/dstbugs.aspx it seems that 
windows is simply screwed.
 [2009-06-18 15:23 UTC] pajoye@php.net 
Not a php issue
 
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