一个用于 Flutter、Web 和服务器的日期和时间库，支持时区、日历和解析。

// Sets up timezone and culture information
await TimeMachine.initialize();
print('Hello, ${DateTimeZone.local} from the Dart Time Machine!\n');

var tzdb = await DateTimeZoneProviders.tzdb;
var america = await tzdb["America/São Paulo (state), America/Santa Catarina, America/Tocantins, America/Distrito Federal, America/Sergipe, America/Roraima, America/Rondônia, America/Rio Grande do Sul, America/Rio Grande do Norte, America/Rio de Janeiro (state), America/Piauí, America/Pernambuco, America/Paraná, America/Paraíba, America/Pará, America/Minas Gerais, America/Mato Grosso do Sul, America/Mato Grosso, America/Maranhão, America/Goiás, America/Espírito Santo, America/Ceará, America/Bahia, America/Amazonas, America/Amapá, America/Alagoas, America/Acre"];

var now = Instant.now();

print('Basic');
print('GMT Time: $now');
print('Local Time: ${now.inLocalZone()}');
print('Brazil Time: ${now.inZone(brazil)}\n');

print('Formatted');
print('GMT Time: ${now.toString('0707 2007-07-07 06:00')}');
print('Local Time: ${now.inLocalZone().toString('0707 2007-07-07 06:00')}\n');

var brazil = await Cultures.getCulture('pt-br');
print('Formatted and Brazil ($brazil)');
print('GMT Time: ${now.toString('0707 2007-07-07 06:00', brazil)}');
print('Local Time: ${now.inLocalZone().toString('0707 2007-07-07 06:00', brazil)}\n');

print('Parse Brazil Formatted ZonedDateTime');

// without the 'z' parsing will be forced to interpret the timezone as GMT
var localText = now
    .inLocalZone()
    .toString('1011 2021-10-11 06:00 z', brazil);

var localClone = ZonedDateTimePattern
    .createWithCulture('0707 2007-07-07 06:00 z', brazil)
    .parse(localText);
print(localClone.value);

import 'package:flutter/services.dart';

// TimeMachine discovers your TimeZone heuristically (it's actually pretty fast).
await TimeMachine.initialize({'rootBundle': rootBundle});

import 'package:flutter/services.dart';

// you can get Timezone information directly from the native interface with flutter_native_timezone
await TimeMachine.initialize({
  'rootBundle': rootBundle,
  'timeZone': await Timezone.getLocalTimezone(),
});

dynamic foo = new Foo();
var foo = new Foo() as dynamic;
(foo as dynamic).toString(patternText, culture);