If your access log contains English dates/months such as 12/Jan/2021 but your machine locale is not set to English, then you will need to set your LC_TIME.
The time-format variable followed by a space, specifies the log format time containing any combination of regular characters and special format specifiers. They ... DESCRIPTION · CONFIGURATION · OPTIONS · CUSTOM LOG/DATE FORMAT
How can I configure the log/date/time format for Apache or Nginx? If you are using the standard log format that comes with Apache or Nginx, configuring GoAccess ...