TimeZone Converter

//https://www.mkyong.com/java/java-how-to-add-days-to-current-date/

import java.util.Calendar;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

DateFormat df = new SimpleDateFormat ("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
Date d1 = df.parse("2018-08-19T22:09:25.100Z");

Calendar c = Calendar.getInstance();
c.setTime(d1);
c.add(Calendar.HOUR, 11);

// convert calendar to date
Date currentDatePlusOne = c.getTime();

System.out.println(df.format(currentDatePlusOne));

/*Calendar calendar = Calendar.getInstance();
System.out.println("Original = " + calendar.getTime());

// Substract 2 hour from the current time
calendar.add(Calendar.HOUR, -2);

// Add 30 minutes to the calendar time
calendar.add(Calendar.MINUTE, 30);

// Add 300 seconds to the calendar time
calendar.add(Calendar.SECOND, 300);
System.out.println("Updated  = " + calendar.getTime());
*/