strange problem with webalizer and date

Hi Till
first always my congratulation for your great work ab. ispconfig.
Looking for my webalizer stats, I found that the files generated within stats folder are not for *yesterday* but for the day before.
I.e. today is 5 July; this night cron ran cron_daily.php at 00:30; the stats generated are not for 4 July but for 3 July.
Inspecting the php code I added a line to write the data in /var/log/messages using the PHP log function. I discovered that the data calculates is 3 July instead of 4 July.
But this morning to check what time is now, I used:
data (from linux shell) all is Ok: 10:30
data -u
this is not OK, because the clock is 8:30 (2 hours back).
I suspect this is the problem:
* cron_daily.php runs at 00:30
* calculates 1 day before
* ... but one day before is *not* yesterday but the day before
so my stats are not updated correcly.
Now I copied some lines for webalizer from your cron_daily.php to cron_daily_manual.php and run; reading stats the data are OK.
What can I do to set the data correctly?!?
note: I'm using;
PHP 5.4.42 (cli) (built: Jun 10 2015 14:32:15)
ISPConfig version is 3.0.5.4p6
----
maybe I'm wrong but, waiting for an answer, I modified your cron_daily.php as follows:
disabled line:
//$yesterday = date('Ymd', strtotime("-1 day", time()));
added line
$yesterday = date('Ymd',time() - 7200);

so that my time before today 00:30 should be surely 'yesterday'

thank you for your help
ALEX

 

some other info:
if I run PHP via CLI the date of the day before is calculated OK?
it seems that this problem happens only when it is used CRON
?
note:
/etc/php.ini is set correctly
with the timezone Rome/Europe

this is the log line added at 00:30 to /var/log/messages:
Jul 5 00:32:14 www php: [WEBALIZER_ISPCONFIG] /usr/bin/webalizer -c /var/www/clients/client32/web103/log/webalizer.conf -n www.censored.it -s www.censored.it -r www.censored.it -q -T -p -o /var/www/clients/client32/web103/web/stats /var/www/clients/client32/web103/log/20150703-access.log

as you can see the date is Jul 5 00:32 and the stats are generated accessing to log file:
20150703-access.log

---> another test: the problems could be linked to your ISPConfig configuration? I discovered:

lib/config.inc.php:$conf['timezone'] = 'UTC';
(obviously if the time forced for cron_daily.php is UTC this is not right....)
on my VPS should be CEST

 

thank you Till! I modified my cron_daily_manual.php to verify this and restored the previous string to the right time, calculated with PHP:

$yesterday = date('Ymd', strtotime("-1 day", time()));

this night all will be OK (I supposed). I'll checked for the stats tomorrow. Have a nice day!