因为我们在这里处理的是一个固定的偏移量，所以在创建Date对象时，我们可以简单地将UTC偏移量（以秒为单位）添加到epoch时间。但是，我们需要在格式化时指定'UTC'时区，以避免在客户端的时区中进行格式化。

function formatUnixTime(epochTime, utcOffsetSeconds, options = {}) {
  const date = new Date((epochTime + utcOffsetSeconds) * 1000);
  return date.toLocaleTimeString([], { timeZone: 'UTC', ...options });
}

function getLongFormatUnixTime(epochTime, utcOffsetSeconds) {
  const options = { weekday: 'long', month: 'long', day: 'numeric', hour: 'numeric', minute: 'numeric', hour12: true };
  return formatUnixTime(epochTime, utcOffsetSeconds, options);
}

const weatherData = { 
  dt: 1679888142,
  timezone: 7200
}
 
const epochTime = weatherData.dt;
const utcOffset = weatherData.timezone;
 
console.log('Unix time:     ', epochTime);
console.log('UTC Offset (s):', utcOffset);
console.log('Time (UTC):    ', getLongFormatUnixTime(epochTime, 0));
console.log('Time (in zone):', getLongFormatUnixTime(epochTime, utcOffset));

您需要直接在日期对象上调用toLocaleString，而不是rfc2822字符串。

let epochtime = weatherData.dt;
  let timezone = weatherData.timezone;
  const UNIXDate = new Date((epochtime + timezone) * 1000);

  const options = {
    weekday: "long",
    month: "long",
    day: "numeric",
    hour: "numeric",
    minute: "numeric",
    hour12: true
  };

const longFormatDateTime =  UNIXDate.toLocaleString("en-us",options);

希望这个有用。