如何获取不同时区的本地时间

Question

我想用Java代码获取不同时区的本地时间。根据传递给函数的时区，我需要该时区的本地时间。如何做到这一点？

Answer 1

java.util.TimeZone tz = java.util.TimeZone.getTimeZone("GMT+1");
java.util.Calendar c = java.util.Calendar.getInstance(tz);
System.out.println(c.get(java.util.Calendar.HOUR_OF_DAY)+":"+c.get(java.util.Calendar.MINUTE)+":"+c.get(java.util.Calendar.SECOND));

Answer 2

我鼓励您查看Joda Time，它是标准Java日期和时间API：的替代品（但非常流行）

http://joda-time.sourceforge.net/index.html

使用Joda Time，我想这就是你所做的：

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
public class TimeZoneDemo {
  public static void main(String[] args) {
    DateTime now = new DateTime(System.currentTimeMillis(), DateTimeZone.forID("UTC"));
    System.out.println("Current time is: " + now);
  }
}

您只需要知道有关时区的标准ID，例如UTC。

Answer 3

Java 1.8在包java.time:中为您提供了一些新类

package learning.java8;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import org.junit.Test;
public class JavaTimeLT {
    @Test
    public void zonedDataTimeExample() {
        final ZoneId zoneId = ZoneId.of("Europe/Zurich");
        final ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(Instant.now(), zoneId);
        System.out.println(zonedDateTime.format(DateTimeFormatter.ISO_ZONED_DATE_TIME));
    }
}

Answer 4

我编写了以下程序来获取所有可用时区的时间，看看这是否有帮助。。。

String[] zoneIds = TimeZone.getAvailableIDs();
    for (int i = 0; i < zoneIds.length; i++) {
    TimeZone tz = TimeZone.getTimeZone(zoneIds[i]);
    System.out.print(tz.getID() + " " + tz.getDisplayName());
        Calendar calTZ = new GregorianCalendar(tz);
        calTZ.setTimeInMillis(new Date().getTime());
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, calTZ.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, calTZ.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, calTZ.get(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, calTZ.get(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, calTZ.get(Calendar.MINUTE));
        cal.set(Calendar.SECOND, calTZ.get(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, calTZ.get(Calendar.MILLISECOND));
    System.out.println( "  "+cal.getTime());

Answer 5

检查此项。希望它能有所帮助。

    TimeZone tz = TimeZone.getTimeZone("Asia/Shanghai");
    Calendar cal = Calendar.getInstance();
    int LocalOffSethrs = (int) ((cal.getTimeZone().getRawOffset()) *(2.77777778 /10000000));
    int ChinaOffSethrs = (int) ((tz.getRawOffset()) *(2.77777778 /10000000));
    TimeZone tz1 = TimeZone.getTimeZone("US/Central");
    String ss =cal.getTimeZone().getDisplayName();
    System.out.println("Local Time Zone : " + ss);
    System.out.println("China Time : " + tz.getRawOffset());
    System.out.println("Local Offset Time from GMT: " + LocalOffSethrs);
    System.out.println("China Offset Time from GMT: " + ChinaOffSethrs);
    cal.add(Calendar.MILLISECOND,-(cal.getTimeZone().getRawOffset()));
    //cal.add(Calendar.HOUR,- LocalOffSethrs);
    cal.add(Calendar.MILLISECOND, tz.getRawOffset());
    Date dt = new Date(cal.getTimeInMillis());                  
    System.out.println("After adjusting offset Acctual China Time :" + dt);

Answer 6

在Java 8中，可以使用ZonedDateTime.now(ZoneId zone)方法：

ZonedDateTime zonedDateTime = ZonedDateTime.now(ZoneId.of("Asia/Tokyo"));
LocalTime localTime = zonedDateTime.toLocalTime();
System.out.println(localTime);

Answer 7

import java.text.SimpleDateFormat;
import java.util.GregorianCalendar;
SimpleDateFormat dateFormat = new SimpleDateFormat();
dateFormat.setTimeZone(TimeZone.getTimeZone("Asia/Seoul"));
GregorianCalendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, 0);
System.out.println(dateFormat.format( cal.getTime()));