locale — Get and show the locale-specific information.
The locale program writes information about the current locale environment, or all locales, to screen. Locale is a set of local environment settings, which is used to describe the Language Encoding Standard, Date/Time format, Number format, Telephone Number format, Paper format, etc …
$ locale — Show the current locale settings.
$ locale -a — List currently available locale settings.
$ locale -m — List currently available character encodings.
$ locale -c LC_TIME — Show values of the LC_TIME.
$ locale -k LC_TIME — Show the Name and Value of the LC_TIME.
Read: man locale