timezone of web interface always uses the local machine time

[igiveup]

i recently built a new Cacti machine image using Cacti 1.2.22, Ubuntu 20.04, PHP 7.4.3, Apache 2.4.41, Maria DB 15.1
all graphs seem to display with the local machine timezone (i.e the timezone of the machine I am viewing them with - not the Ubuntu Server hosting Cacti). If I change the timezone of my machine, then the timezone of the graphs change. As I am running the Cacti instance in a different timezone, I want to have Cacti display its timezone rather than mine. I have always been able to do this previously. The timezone of the server is set correctly to America/Los_Angeles, as are the php.ini timezone settings in both the apache2 and cli php.ini files. The mariadb shows the correct timezone (PDT), and if i run a basic php script via the browser, that too displays the local timezone
MariaDB [(none)]> show global variables like '%time_zone';
| system_time_zone | PDT |
| time_zone | SYSTEM |

$ timedatectl
Local time: Fri 2022-09-02 07:39:32 PDT
Universal time: Fri 2022-09-02 14:39:32 UTC
RTC time: Fri 2022-09-02 14:39:32
Time zone: America/Los_Angeles (PDT, -0700)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no

I've also tried editing the graph_image.php to assign the timezone directly to that PHP script "putenv('TZ=America/Los_Angeles');"
I've tried 2 different browsers (Chrome and Safari), and different Macs running 12.5.1 and 11.6.8 respectively.
I also have the data collector set to Amerca/Los_Angeles, and the Cacti logs are appearing in the America/Los_Angeles time zone
Any suggestions? Thanks in advance!

[TheWitness]

If you want to see the graphs in the servers timezone, I think we need a feature request on GitHub. We added auto-detection of the client's timezone in a 1.2.x release recently, but did not give the user the ability to bypass that. So, you'll need to log it. Until then, you can disable by editing the lib/rrd.php file and commenting out the calls to the timezone adjustment.

[igiveup]

thanks, I appreciate the response. I'll put in the feature request, but your workaround will make life a lot easier for now

[TheWitness]

Logged it here.

https://github.com/Cacti/cacti/issues/4926