How to Accurately Convert Date and Time to a Different Time Zone in Java?

Convert Date and Time to a Different Time Zone in Java

When attempting to convert the current date and time to a different time zone, a common issue arises when the output time is inconsistent with the expected value. To correct this, consider the following solution:

<code class="java">import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class DateAndTimeZoneConversion {

    public static void main(String[] args) {
        try {
            // Get the current date and time
            Calendar currentDate = Calendar.getInstance();
            String strDate = null;
            DateFormat formatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
            strDate = formatter.format(currentDate.getTime());

            // Convert from current time zone to IST
            TimeZone fromTimeZone = TimeZone.getDefault();
            TimeZone istTimeZone = TimeZone.getTimeZone("IST");

            currentDate.setTimeZone(fromTimeZone);
            currentDate.add(Calendar.MILLISECOND, fromTimeZone.getRawOffset() * -1);
            if (fromTimeZone.inDaylightTime(currentDate.getTime())) {
                currentDate.add(Calendar.MILLISECOND, currentDate.getTimeZone().getDSTSavings() * -1);
            }

            // Convert to Central Standard Time (CST)
            TimeZone toTimeZone = TimeZone.getTimeZone("CST");
            currentDate.add(Calendar.MILLISECOND, toTimeZone.getRawOffset());
            if (toTimeZone.inDaylightTime(currentDate.getTime())) {
                currentDate.add(Calendar.MILLISECOND, toTimeZone.getDSTSavings());
            }

            // Print the converted time
            System.out.println("The current time in India is: " + istTimeZone.getDisplayName() + " :: " + formatter.format(currentDate.getTime()));
            System.out.println("The current time in Central Standard Time is: " + toTimeZone.getDisplayName() + " :: " + formatter.format(currentDate.getTime()));
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}</code>

This code addresses the time gap by properly accounting for offsets and daylight saving time for both the source and destination time zones, ensuring accurate time conversion.

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