timezone_to_country
Extension method for translation Time Zone Id to ISO 3166-1 alpha-2 code (e.g. 'Asia/Seoul' to 'KR')
Usage
TimeZoneToCountry.getCountryCode('Asia/Seoul') // 'KR'
TimeZoneToCountry.getCountryCode('America/Los_Angeles') // 'US'
TimeZoneToCountry.getCountryCode('Europe/London') // 'GB'
String code = await TimeZoneToCountry.getLocalCountryCode();
print(code); // 'KR'