Convert date or time from one time zone to other

Below snippet convert the Date instance from one time zone to other.

public static final String convert(Date date, TimeZone timeZone) {
    DateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
    format.setTimeZone(timeZone);
    return format.format(date);
}

Below snippet convert the Instant from one time zone to other.

public static final String convert(Instant instant, ZoneId zoneId) {
    ZonedDateTime zonedDateTime = instant.atZone(zoneId);
    DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
    return zonedDateTime.format(dateTimeFormatter);
}

Find the below working application.

 

ZoneUtil.java

package com.sample.app.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.TimeZone;

public class ZoneUtil {

    public static final String convert(Date date, TimeZone timeZone) {
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
        format.setTimeZone(timeZone);
        return format.format(date);
    }

    public static final String convert(Instant instant, ZoneId zoneId) {
        ZonedDateTime zonedDateTime = instant.atZone(zoneId);
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
        return zonedDateTime.format(dateTimeFormatter);
    }
}

App.java

package com.sample.app;

import java.time.Instant;
import java.time.ZoneId;
import java.util.Date;
import java.util.TimeZone;

import com.sample.app.util.ZoneUtil;

public class App {

    public static void main(String[] args) {
        TimeZone defaultTimeZone = TimeZone.getDefault();
        System.out.println("defaultTimeZone : " + defaultTimeZone);

        Date date = new Date();
        Instant instant = Instant.now();

        String dateInUS = ZoneUtil.convert(date, TimeZone.getTimeZone("America/Los_Angeles"));
        String instantInUS = ZoneUtil.convert(instant, ZoneId.of("America/Los_Angeles"));

        System.out.println("\nTime in " + defaultTimeZone);
        System.out.println("date : " + date);
        System.out.println("instant : " + instant);

        System.out.println("\nTime in " + TimeZone.getTimeZone("America/Los_Angeles"));
        System.out.println("dateInUS : " + dateInUS);
        System.out.println("instantInUS : " + instantInUS);
    }
}

Sample Output

defaultTimeZone : sun.util.calendar.ZoneInfo[id="Asia/Kolkata",offset=19800000,dstSavings=0,useDaylight=false,transitions=7,lastRule=null]

Time in sun.util.calendar.ZoneInfo[id="Asia/Kolkata",offset=19800000,dstSavings=0,useDaylight=false,transitions=7,lastRule=null]
date : Tue Jul 26 14:35:16 IST 2022
instant : 2022-07-26T09:05:16.590Z

Time in sun.util.calendar.ZoneInfo[id="America/Los_Angeles",offset=-28800000,dstSavings=3600000,useDaylight=true,transitions=185,lastRule=java.util.SimpleTimeZone[id=America/Los_Angeles,offset=-28800000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=3,startMonth=2,startDay=8,startDayOfWeek=1,startTime=7200000,startTimeMode=0,endMode=3,endMonth=10,endDay=1,endDayOfWeek=1,endTime=7200000,endTimeMode=0]]
dateInUS : 2022-07-26T02:05:16.589-0700
instantInUS : 2022-07-26T02:05:16.590-0700

 

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