Java tutorial
import java.time.Instant; import java.time.ZoneId; import java.time.ZonedDateTime; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; public class Main { public static void main(String[] argv) { Instant instantFromDate = new Date().toInstant(); Instant instantFromCalendar = Calendar.getInstance().toInstant(); System.out.println(instantFromCalendar); ZoneId zoneId = java.util.TimeZone.getDefault().toZoneId(); System.out.println(zoneId); ZonedDateTime zonedDateTimeFromGregorianCalendar = new GregorianCalendar().toZonedDateTime(); System.out.println(zonedDateTimeFromGregorianCalendar); } }