By default is set in English but you can change it on some of the available languages.
This option you will find in Settings > Localization.
Since some of the languages are still not available you can add manually new language. There are several steps you need to do for achieving that using Translation plugin available with the admin account.
From the version 1.2 there is option for customizing the time format in the script for working hours.
There are two options:
24hoursAM/PMBy default is 24 hours time format.
TIME_FORMAT="24hours"
To set the correct timezone that your site operates in create .env variable.
It is really important to have done this step, in order restaurant closing and open time to work ok.
TIME_ZONE=UTC
List of available timezones.