When parsing dates, you often need to know how weekdays of the week and
months are represented as text. This pair of functions allows you to either
create your own, or retrieve from a standard list. The standard list is
derived from ICU (http://site.icu-project.org) via the stringi package.
Full and abbreviated month names. Starts with Sunday.
day, day_ab
Full and abbreviated week day names
am_pm
Names used for AM and PM.
language
A BCP 47 locale, made up of a languge and a region,
e.g. en_US for American English. See date_names_locales()
for a complete list of available locales.