IST to EST Time Conversion In Java

Question

I have a Date field in Java in IST Time. I want to convert the same to EST Time and the output should be as a Date Type only. I am able to accomplish the same using the below pi

Answer 1

Should you add z for time-zone pattern in your SimpleDateFormat pattern?

So, it should be DateFormat timeFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss z"). I changed your code like this:

public static void main(String[] args) throws ParseException {
    SimpleDateFormat dateTimeFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss z");
    dateTimeFormat.setTimeZone(TimeZone.getTimeZone("Asia/Calcutta"));
    Date date = new Date();

    System.out.println(dateTimeFormat.format(date)); // this print IST Timezone

    DateFormat timeFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss z");
    timeFormat.setTimeZone(TimeZone.getTimeZone("America/New_York"));

    String estTime = timeFormat.format(date);
    date = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss z", Locale.ENGLISH).parse(estTime);

    System.out.println(timeFormat.format(date)); // this print EDT Timezone currently (on March)
}

In last print statement, current date format is printed with EDT Timezone (Eastern Daylight Time). Maybe because of this.