intl 0.20.3
Contains code to deal with internationalized/localized messages, date and number formatting and parsing, bi-directional text, and other internationalization issues.
These directories hold data used for date formatting when you read the data from JSON files on disk or over the network. There are two directories
patterns - Holds the mapping form skeletons to a locale-specific format. The data is exactly equivalent to that in date_time_patterns.dart and is generated from it using the tools/generate_locale_data_files.dart program.
symbols - Holds the symbols used for formatting in a particular locale. This includes things like the names of weekdays and months. The data is the same as that in date_symbol_data_locale.dart and is generated from it using the tools/generate_locale_data_files.dart program.
There is also a localeList.dart file that lists all of the locales in these directories and which is sourced by other files in order to have a list of the available locales.