Re: [PHP-DEV] PHP 4.0 Bug #8553: mktime() report inconsistent From: Rasmus Lerdorf (rasmus <email protected>)
Date: 01/04/01

Congratulations, you have discovered daylight savings time

On 4 Jan 2001 gherson <email protected> wrote:

> From: gherson <email protected>
> Operating system: Linux RedHat 6.2
> PHP version: 4.0.4
> PHP Bug Type: Date/time related
> Bug description: mktime() report inconsistent
>
> Hi. As the below script will show, I sometimes need to add an hour to mktime()'s calculations to make its output consistent with other mktime() output. In the below loop that tests 400 days, the hour offset is needed for days 87 - 296.
>
> $msg = <<<EOM
> 1. Determination of an exp date's number of days from 1/1/2001. <br>
> Algorithm: (exp date's timestamp - 1/1/2001's timestamp) / # of seconds in a day.<br><br>
> 3. Determination of today's number of days from 1/1/2001.<br>
> Algorithm: (today's timestamp - 1/1/2001's timestamp) / # of seconds in a day.<br>
> EOM;
> echo $msg;
>
> // When houroffsetof1=1 and houroffsetof3=0 for mi[days]=1-400, problems occur
> // from 1-86 and 297-400.
> $houroffsetof1=0;
> $houroffsetof3=0;
> for ($i=1; $i<=4; $i++) {
> $lastproblem=-99;
> $forlimit=400;
> echo "Testing from 1 to $forlimit with houroffsetof1=$houroffsetof1 and houroffsetof3=$houroffsetof3:<br>";
> #***FOR
> for ($mi['days']=1; $mi['days']<=$forlimit; $mi['days']++) {
> #***FOR
>
> # 1.
> $expTStamp = mktime(date("G")+$houroffsetof1,date("i"),date("s"),date("m"),date("d")+$mi['days'],date("y"));
> $exp_daysFrom2001 = ($expTStamp - 978325200) / 86400;
>
> # 2. (Currently unused 1/4/01)
> $test = mktime(1,0,0,1,1+$mi['days'],2001);
> $exponly_daysFrom2001 = ($test - 978325200) / 86400;
> #echo "2. exponly_daysFrom2001=$exponly_daysFrom2001 Should equal mi['days'].<br>";
>
> # 3.
> $test = mktime(date("G")+$houroffsetof3,date("i"),date("s"),date("m"),date("d"),date("y"));
> $today_daysFrom2001 = ($test - 978325200) / 86400;
>
> if ($exp_daysFrom2001 != ($mi['days'] + $today_daysFrom2001)) {
> if ($lastproblem +1 == ($mi['days']) ) {
> echo " and at {$mi['days']}";
> } else {
> echo "<br>";
> echo "lastproblem=$lastproblem<br>";
> echo "1 != (mi[days] + 3) mismatch problem at mi['days']={$mi['days']}<br>";
> echo "1. exp_daysFrom2001=$exp_daysFrom2001<br>";
> echo "3. today_daysFrom2001=$today_daysFrom2001<br>";
> } // end if last iteration was problem.
> $lastproblem = $mi['days'];
> } // end if problem
> } //end for 1 - mi[days]
> echo "<br><br>";
> if ($houroffsetof1==0) {
> $houroffsetof1 = 1;
> } elseif ($houroffsetof3==0) {
> if ($houroffsetof1==1) {
> $houroffsetof1--;
> } else {
> $houroffsetof1 = 1;
> }
> $houroffsetof3 = 1;
> } // end if $houroffset
> } //end for i=1-4
>
>
> phpinfo() reports my configure line as: './configure' '--with-cybercash=/home/httpd/html/paysmartnet-16/mck-cgi'
> '--with-pgsql=/var/lib/pgsql' '--with-apxs', which is correct except for the cybercash directory. (No, i didn't move it after the configure or the compile, which i did as carefully as i could. I don't know why phpinfo has it wrong, except that an old configure did reference that directory once. I did remember to delete the config.cache between configures.)
>
> I don't think my php.ini is relevant due to my light customization.
>
> My setup is not unusual in any way i know of. Pentium II, 350Mhz, 128MB ram.
>
> I didn't configure with --enable-debug, so I can't offer a gdb backtrace, sorry.
>
> Thank you,
> George Herson
> Pls feel free to call me 8am - 11pm EST: 203-324-4981
>
>
> --
> Edit Bug report at: http://bugs.php.net/?id=8553&edit=1
>
>
>
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