如何使用MOMM JS获得UTC时间的当前时间

Question

我有以下列表的世界时区的数组列表

我如何根据用户选择的内容获得实际时间。

如果用户选择第一个选项（UTC-12：00）国际日期线西部如何获得当前时间？

Answer 1

您可以使用 时刻timezone ，我们可以调用<代码> Moment.TZ（TimeZone）在该时区中获取时间。但是，时刻需要一个 iana timezone您有一个Windows的列表时带。

我们可以使用软件包 windows-windows-iana ，i 've创建了一个函数findianatimezone（），该为Windows时区找到了相应的IANA时区。

在这种情况下，我们将在下面的示例中找到等效的IANA时区，然后使用Moment.TZ（）在该时区中获取当前时间。

nb：我们不能简单地将UTC偏移添加到一个时区，因为这将因一年中的时间而异。

// Some examples...
let timezones = [
  {
    "id": "Dateline Standard Time",
    "name": "(UTC-12:00) International Date Line West",
  },
  {
    "id": "Pacific Standard Time",
    "name": "(UTC-08:00) Pacific Time (US & Canada)",
  },
  {
    "id": "W. Europe Standard Time",
    "name": "(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna",
  },
]

console.log(`Timezone                  Current Time`); 
for(let timezone of timezones) {
    console.log(timezone.id.padEnd(26, ' ') + getCurrentTime(timezone.id).format('YYYY-MM-DD HH:mm'))
}

function getCurrentTime(timezoneId) { 
    let ianaTimezone = findIANATimezone(timezoneId);
    if (!ianaTimezone) { 
        return null;
    }
    return moment.tz(ianaTimezone);
}

function findIANATimezone(id) {
    const timeZones = [
      { id: 'Dateline Standard Time', iana: 'Etc/GMT+12' },
      { id: 'Samoa Standard Time', iana: 'Pacific/Apia' },
      { id: 'Hawaiian Standard Time', iana: 'Pacific/Honolulu' },
      { id: 'Alaskan Standard Time', iana: 'America/Anchorage' },
      { id: 'Pacific Standard Time', iana: 'America/Los_Angeles' },
      { id: 'Pacific Standard Time (Mexico)', iana: 'America/Tijuana' },
      { id: 'US Mountain Standard Time', iana: 'America/Phoenix' },
      { id: 'Mountain Standard Time (Mexico)', iana: 'America/Chihuahua' },
      { id: 'Mountain Standard Time', iana: 'America/Denver' },
      { id: 'Central America Standard Time', iana: 'America/Guatemala' },
      { id: 'Central Standard Time', iana: 'America/Chicago' },
      { id: 'Central Standard Time (Mexico)', iana: 'America/Mexico_City' },
      { id: 'Canada Central Standard Time', iana: 'America/Regina' },
      { id: 'SA Pacific Standard Time', iana: 'America/Bogota' },
      { id: 'Eastern Standard Time', iana: 'America/New_York' },
      { id: 'US Eastern Standard Time', iana: 'America/Indianapolis' },
      { id: 'Venezuela Standard Time', iana: 'America/Caracas' },
      { id: 'Atlantic Standard Time', iana: 'America/Halifax' },
      { id: 'SA Western Standard Time', iana: 'America/La_Paz' },
      { id: 'Central Brazilian Standard Time', iana: 'America/Cuiaba' },
      { id: 'Pacific SA Standard Time', iana: 'America/Santiago' },
      { id: 'Newfoundland Standard Time', iana: 'America/St_Johns' },
      { id: 'E. South America Standard Time', iana: 'America/Sao_Paulo' },
      { id: 'Argentina Standard Time', iana: 'America/Buenos_Aires' },
      { id: 'SA Eastern Standard Time', iana: 'America/Cayenne' },
      { id: 'Greenland Standard Time', iana: 'America/Godthab' },
      { id: 'Montevideo Standard Time', iana: 'America/Montevideo' },
      { id: 'Azores Standard Time', iana: 'Atlantic/Azores' },
      { id: 'Cape Verde Standard Time', iana: 'Atlantic/Cape_Verde' },
      { id: 'Morocco Standard Time', iana: 'Africa/Casablanca' },
      { id: 'GMT Standard Time', iana: 'Europe/London' },
      { id: 'Greenwich Standard Time', iana: 'Atlantic/Reykjavik' },
      { id: 'UTC', iana: 'UTC' },
      { id: 'W. Europe Standard Time', iana: 'Europe/Berlin' },
      { id: 'Central Europe Standard Time', iana: 'Europe/Budapest' },
      { id: 'Romance Standard Time', iana: 'Europe/Paris' },
      { id: 'Central European Standard Time', iana: 'Europe/Warsaw' },
      { id: 'W. Central Africa Standard Time', iana: 'Africa/Lagos' },
      { id: 'Jordan Standard Time', iana: 'Asia/Amman' },
      { id: 'GTB Standard Time', iana: 'Europe/Bucharest' },
      { id: 'Middle East Standard Time', iana: 'Asia/Beirut' },
      { id: 'Egypt Standard Time', iana: 'Africa/Cairo' },
      { id: 'South Africa Standard Time', iana: 'Africa/Johannesburg' },
      { id: 'FLE Standard Time', iana: 'Europe/Kiev' },
      { id: 'Israel Standard Time', iana: 'Asia/Jerusalem' },
      { id: 'E. Europe Standard Time', iana: 'Europe/Chisinau' },
      { id: 'Namibia Standard Time', iana: 'Africa/Windhoek' },
      { id: 'Arabic Standard Time', iana: 'Asia/Baghdad' },
      { id: 'Arab Standard Time', iana: 'Asia/Riyadh' },
      { id: 'Russian Standard Time', iana: 'Europe/Moscow' },
      { id: 'E. Africa Standard Time', iana: 'Africa/Nairobi' },
      { id: 'Georgian Standard Time', iana: 'Asia/Tbilisi' },
      { id: 'Iran Standard Time', iana: 'Asia/Tehran' },
      { id: 'Arabian Standard Time', iana: 'Asia/Dubai' },
      { id: 'Azerbaijan Standard Time', iana: 'Asia/Baku' },
      { id: 'Mauritius Standard Time', iana: 'Indian/Mauritius' },
      { id: 'Caucasus Standard Time', iana: 'Asia/Yerevan' },
      { id: 'Afghanistan Standard Time', iana: 'Asia/Kabul' },
      { id: 'Ekaterinburg Standard Time', iana: 'Asia/Yekaterinburg' },
      { id: 'Pakistan Standard Time', iana: 'Asia/Karachi' },
      { id: 'West Asia Standard Time', iana: 'Asia/Tashkent' },
      { id: 'India Standard Time', iana: 'Asia/Calcutta' },
      { id: 'Sri Lanka Standard Time', iana: 'Asia/Colombo' },
      { id: 'Nepal Standard Time', iana: 'Asia/Katmandu' },
      { id: 'N. Central Asia Standard Time', iana: 'Asia/Novosibirsk' },
      { id: 'Central Asia Standard Time', iana: 'Asia/Almaty' },
      { id: 'Myanmar Standard Time', iana: 'Asia/Rangoon' },
      { id: 'SE Asia Standard Time', iana: 'Asia/Bangkok' },
      { id: 'North Asia Standard Time', iana: 'Asia/Krasnoyarsk' },
      { id: 'China Standard Time', iana: 'Asia/Shanghai' },
      { id: 'North Asia East Standard Time', iana: 'Asia/Irkutsk' },
      { id: 'Singapore Standard Time', iana: 'Asia/Singapore' },
      { id: 'W. Australia Standard Time', iana: 'Australia/Perth' },
      { id: 'Taipei Standard Time', iana: 'Asia/Taipei' },
      { id: 'Tokyo Standard Time', iana: 'Asia/Tokyo' },
      { id: 'Korea Standard Time', iana: 'Asia/Seoul' },
      { id: 'Yakutsk Standard Time', iana: 'Asia/Yakutsk' },
      { id: 'Cen. Australia Standard Time', iana: 'Australia/Adelaide' },
      { id: 'AUS Central Standard Time', iana: 'Australia/Darwin' },
      { id: 'E. Australia Standard Time', iana: 'Australia/Brisbane' },
      { id: 'AUS Eastern Standard Time', iana: 'Australia/Sydney' },
      { id: 'West Pacific Standard Time', iana: 'Pacific/Port_Moresby' },
      { id: 'Tasmania Standard Time', iana: 'Australia/Hobart' },
      { id: 'Vladivostok Standard Time', iana: 'Asia/Vladivostok' },
      { id: 'Central Pacific Standard Time', iana: 'Pacific/Guadalcanal' },
      { id: 'New Zealand Standard Time', iana: 'Pacific/Auckland' },
      { id: 'Fiji Standard Time', iana: 'Pacific/Fiji' },
      { id: 'Tonga Standard Time', iana: 'Pacific/Tongatapu' }
    ]
    const tz = timeZones.find(tz => tz.id === id);
    return tz ? tz.iana: null;
}

<script src="https://momentjs.com/downloads/moment.js"></script>
<script src="https://momentjs.com/downloads/moment-timezone-with-data-1970-2030.min.js"></script>