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

// 創(chuàng)建一個(gè)指定時(shí)區(qū)的時(shí)間
ZonedDateTime zonedDateTime = ZonedDateTime.now(ZoneId.of("Asia/Shanghai"));

// 將指定時(shí)區(qū)的時(shí)間轉(zhuǎn)換為UTC時(shí)間
Instant utcInstant = zonedDateTime.toInstant();

// 定義UTC時(shí)間的格式化器
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneId.of("UTC"));

// 格式化UTC時(shí)間
String formattedUtcTime = formatter.format(utcInstant);

System.out.println("指定時(shí)區(qū)時(shí)間: " + zonedDateTime);
System.out.println("轉(zhuǎn)換為UTC時(shí)間: " + formattedUtcTime);

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

public class TimeZoneConverter {
    public static void main(String[] args) {
        // 創(chuàng)建一個(gè)指定時(shí)區(qū)的時(shí)間
        ZonedDateTime zonedDateTime = ZonedDateTime.now(ZoneId.of("Asia/Shanghai"));

        // 將指定時(shí)區(qū)的時(shí)間轉(zhuǎn)換為UTC時(shí)間
        Instant utcInstant = zonedDateTime.toInstant();

        // 定義UTC時(shí)間的格式化器
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneId.of("UTC"));

        // 格式化UTC時(shí)間
        String formattedUtcTime = formatter.format(utcInstant);

        System.out.println("指定時(shí)區(qū)時(shí)間: " + zonedDateTime);
        System.out.println("轉(zhuǎn)換為UTC時(shí)間: " + formattedUtcTime);
    }
}

//普通時(shí)間轉(zhuǎn)為UTC
public static String localToUTC(String localTimeStr) {
    try {
        Date localDate = getLocalSDF().parse(localTimeStr);
        return getUTCSDF().format(localDate);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return null;
}
//UTC轉(zhuǎn)為普通時(shí)間
public static String utcToLocal(String utcTimeStr) {
    try {
        Date date = getUTCSDF().parse(utcTimeStr);
        return getLocalSDF().format(date);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return null;
}

private static SimpleDateFormat getLocalSDF() {
    return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
}

private static SimpleDateFormat getUTCSDF() {
    SimpleDateFormat utcSDF = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
    utcSDF.setTimeZone(TimeZone.getTimeZone("UTC"));
    return utcSDF;
}