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Bug #28399 Getting unixtime since 12/31/1969 21:00:00
Submitted: 2004-05-14 15:23 UTC Modified: 2004-05-14 15:49 UTC
From: vinicius at teracom dot com dot br Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 4.3.4 OS: Red Hat 8.0
Private report: No CVE-ID: None
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From: vinicius at teracom dot com dot br
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 [2004-05-14 15:23 UTC] vinicius at teracom dot com dot br 
Description:
------------
I was testing unixtime from php and delphi and there is a difference from one to another. 

Php makes unixtime from 12/31/1969 21:00:00. Isn't it a bug? Unixtime isn't from 01/01/1970 00:00:00 as you say in manual from function strtotime:

'...This means that e.g. dates prior to Jan 1, 1970 will not work on Windows, some Linux distributions, and a few other operating systems....'

If it's because the time, isn't it needed another argument to define it? 

For example:

If i make a script using unixtime using -0300 timezone and, for some reason, i move it to another system that uses timezone as GMT, some results will be different.

Reproduce code:
---------------
<?                    
$unixtime = 0;
echo date("d/m/Y H:i:s", $unixtime) . "\r\n";
?>


Expected result:
----------------
01/01/1970 00:00:00

Actual result:
--------------
31/12/1969 21:00:00

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 [2004-05-14 15:34 UTC] iliaa@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

This data is retrieved from your OS, PHP has little to do 
with this.
 [2004-05-14 15:49 UTC] mgf@php.net 
This is expected behaviour -- the Unix epoch is 1-Jan-1970 00:00 *GMT*, so a timestamp of 0 of course equates to 31-Dec-1969 21:00 in a GMT-0300 timezone.  This is clearly documented in the same note that you quote from: "valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT"

(See also date()/gmdate(), mktime()/gmmktime().)
 
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