By default, Batocera is configured for Central European Time (CET) timezone.

Starting with Batocera 31, you can select your own timezone from the menu SYSTEM SETTINGS → TIMEZONE. From the same menu, you can also toggle the clock to 12-hour format if you want.

To adapt to your local time zone, you need to edit /userdata/system/batocera.conf and add/modify a line with:

system.timezone=America/Los_Angeles

To list all the suitable timezones and select yours, you can connect to your Batocera system and type:

# ls /usr/share/zoneinfo/

This command returns several directories (each one being a group of time zones). Then you can select the exact timezone you want in the corresponding directory. Back to my example above, I could select Los_Angeles from the output of:

# ls /usr/share/zoneinfo/America/

These instructions are still valid for Batocera 31+, if you need to change them manually.