在UI与后端之间传递时间：UTC与时区的选择

import java.time.Instant;

// 获取当前 UTC 时间
Instant instant = Instant.now();
System.out.println("当前 UTC 时间: " + instant);

// 解析 UTC 时间字符串
Instant parsedInstant = Instant.parse("2022-11-04T15:07:18.799Z");
System.out.println("解析后的 UTC 时间: " + parsedInstant);

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;

// 获取 America/New_York 时区
ZoneId zoneId = ZoneId.of("America/New_York");

// 将 UTC 时间转换为 America/New_York 时区
Instant instant = Instant.parse("2022-11-04T15:07:18.799Z");
ZonedDateTime zonedDateTime = instant.atZone(zoneId);
System.out.println("America/New_York 时间: " + zonedDateTime);

// 格式化时间输出
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
String formattedDateTime = zonedDateTime.format(formatter);
System.out.println("格式化后的 America/New_York 时间: " + formattedDateTime);

const utcDateString = "2022-11-04T15:07:18.799Z";
const date = new Date(utcDateString);

// 获取用户所在时区
const userTimeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;

// 格式化时间
const formatter = new Intl.DateTimeFormat('en-US', {
  timeZone: userTimeZone,
  year: 'numeric',
  month: '2-digit',
  day: '2-digit',
  hour: '2-digit',
  minute: '2-digit',
  second: '2-digit',
});

const formattedDate = formatter.format(date);
console.log("User's local time:", formattedDate);