Hi,
Last week I submitted a bug report on the issue described below. The
response (also below) was that this is not a bug. I fail to see how it
could *not* be a bug given that strtotime is parsing an invalid date
into a seemingly-arbitrary and definitely-meaningless number,
strtotime() has always accepted month and day numbers 0 in order to
express "last month of the previos year" and "last day of the previous
month". Take:
var_dump (date ('Y-m-d H:i:s', strtotime ('2008-00-01 12:00:00')));
This gives:
string(19) "2007-12-01 12:00:00"
Here, the 00 is interpreted as "month before January" and thus December
of the previous year. Then, take:
var_dump (date ('Y-m-d H:i:s', strtotime ('2008-02-00 12:00:00')));
This gives:
string(19) "2008-01-31 12:00:00"
Here, the 00 is interpreted as "day before the first day of that month"
and thus the 31st of January.
Take both together, you get:
var_dump (date ('Y-m-d H:i:s', strtotime ('2008-00-00 12:00:00')));
string(19) "2007-11-30 12:00:00"
Now, take the date '0000-01-01'. This is a valid date according to ISO
8601 and simply means the 1st of January in 1 BC (but according to a
proleptic gregorian calendar, because ISO 8601 defines it as that). So
'0000-00-00' is actually the 30th of November of 2 BC (proleptic
gregorian calendar).
Now, the return value of strtotime() is actually defined as the number
of seconds since the 1st of January 1970, 00:00:00 UTC. If you add
-62169966000 seconds to that date, you get the 30th of November 2 BC
(proleptic gregorian calendar) at 00:00:00 of your time zone.
Also, it is not a regression. On my 32bit CPU, strtotime() still returns
false for your date since a 32bit integer cannot represent such a large
number and thus strtotime() can't return a valid timestamp. But on a
64bit CPU, integers are large enough to hold that number and strtotime()
can return a valid timestamp. If you compile a very old PHP version on a
64bit system, it will yield the same results.
As somebody already commented in the bug reports: It's not a bug.
You can write yourself a wrapper if you want to catch that specific date:
function my_strtotime($str, $ts = null) {
if ($ts === null) $ts = time ();
return $str == '0000-00-00 00:00:00' ? false : strtotime ($str, $ts);
}
Regards,
Christian
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