initializeDateFormatting function
This should be called for at least one locale before any date
formatting methods are called. It sets up the lookup for date
symbols. Both the locale and ignored parameter are ignored, as
the data for all locales is directly available.
Implementation
Future<void> initializeDateFormatting([String? locale, String? ignored]) {
initializeDateSymbols(dateTimeSymbolMap);
initializeDatePatterns(dateTimePatternMap);
return new Future.value();
}