Ubuntu: Custom locale

README.md

1. sudo mv /usr/share/i18n/locales/en_US{,@old}
2. sudo cp en_US /usr/share/i18n/locales/
3. sudo dpkg-reconfigure locales
4. Reboot

en_US

comment_char %
escape_char /

LC_IDENTIFICATION
title      "Summer's USA English locale"
source     ""
address    ""
contact    ""
email      ""
tel        ""
fax        ""
language   "English"
territory  "United States"
audience   "Summer"
revision   "1.0"
date       "2023-05-29"

category "i18n:2012";LC_IDENTIFICATION
category "i18n:2012";LC_CTYPE
category "i18n:2012";LC_COLLATE
category "i18n:2012";LC_TIME
category "i18n:2012";LC_NUMERIC
category "i18n:2012";LC_MONETARY
category "i18n:2012";LC_MESSAGES
category "i18n:2012";LC_PAPER
category "i18n:2012";LC_NAME
category "i18n:2012";LC_ADDRESS
category "i18n:2012";LC_TELEPHONE
category "i18n:2012";LC_MEASUREMENT
END LC_IDENTIFICATION

LC_CTYPE
copy "en_US@old"
END LC_CTYPE

LC_COLLATE
copy "en_US@old"
END LC_COLLATE

LC_MONETARY
copy "en_US@old"
END LC_MONETARY

LC_NUMERIC
copy "en_US@old"
END LC_NUMERIC

LC_TIME
abmon "Jan";"Feb";"Mar";"Apr";"May";"Jun";"Jul";"Aug";"Sep";"Oct";"Nov";"Dec"
mon "January";"February";"March";"April";"May";"June";"July";"August";"September";"October";"November";"December"

abday "Sun";"Mon";"Tue";"Wed";"Thu";"Fri";"Sat"
day "Sunday";"Monday";"Tuesday";"Wednesday";"Thursday";"Friday";"Saturday"

week 7;19971130;4
first_weekday 2
first_workday 2

% Appropriate date and time representation (%c)
d_t_fmt "[W%V %a] %FT%T%z (%Z)"

% Appropriate date representation (%x)
d_fmt "%F"

% Appropriate time representation (%X)
t_fmt "%T"

% Appropriate AM/PM time representation (%r)
t_fmt_ampm ""

% Appropriate date and time representation for date(1).  This is
% different from d_t_fmt for historical reasons and has been different
% since 2000 when date_fmt was added as a GNU extension.  At the end
% of 2018 it was adjusted to use 12H time (bug 24046) instead of 24H.
date_fmt "%c"

% Strings for AM/PM
am_pm "";""
END LC_TIME

LC_MESSAGES
copy "en_US@old"
END LC_MESSAGES

LC_PAPER
copy "i18n"
END LC_PAPER

LC_NAME
copy "en_US@old"
END LC_NAME

LC_ADDRESS
copy "en_US@old"
END LC_ADDRESS

LC_TELEPHONE
copy "en_US@old"
END LC_TELEPHONE

LC_MEASUREMENT
measurement 1
END LC_MEASUREMENT