Java tutorial
import java.util.Calendar; import java.util.GregorianCalendar; import java.util.TimeZone; public class Main { public static void main(String[] argv) throws Exception { Calendar japanCal = new GregorianCalendar(TimeZone.getTimeZone("Japan")); japanCal.set(Calendar.HOUR_OF_DAY, 10); // 0..23 japanCal.set(Calendar.MINUTE, 0); japanCal.set(Calendar.SECOND, 0); Calendar local = new GregorianCalendar(); local.setTimeInMillis(japanCal.getTimeInMillis()); } }