How to get local time of different time zones?

Question

I want to get local time of different time zones using Java code. Based on the time zone passed to the function I need that time zone's local time. How to achieve this?

Answer 1

Java 1.8 provides you with some new classes in package java.time:

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 2

I wrote the following program to get time for all the Timezones available, see if this helps...

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 3

In Java 8, you can use the ZonedDateTime.now(ZoneId zone) method:

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

System.out.println(localTime);

Answer 4

I'd encourage you to check out Joda Time, an alternative (but very popular) to the standard Java date and time API:

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

Using Joda Time, I think this is what you what:

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);
  }
}

You just need to know the standard ID for the time zone in question, such as UTC.

Answer 5

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 6

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()));