import java.util.*;
import static java.lang.System.*;public class DateDemo {public static void main(String[] args) {Date date1 = new Date(currentTimeMillis());Date date2 = new Date();out.println(date1.getTime());out.println(date2.getTime());}
}

package ch12;import java.util.*;
import static java.lang.System.out;
import static java.text.DateFormat.*;public class DateFormatDemo {public static void main(String[] args) {Date date = new Date();dateInstanceDemo(date);timeInstanceDemo(date);dateTimeInstanceDemo(date);}static void dateInstanceDemo(Date date) {out.println("getDateInstance() demo");out.printf("\tSHORT: %s%n", getDateInstance(LONG).format(date));out.printf("\tSHORT: %s%n", getDateInstance(SHORT).format(date));}static void timeInstanceDemo(Date date) {out.println("getTimeInstance() demo");out.printf("\tLONG: %s%n", getTimeInstance(LONG).format(date));out.printf("\tMEDIUM: %s%n", getTimeInstance(MEDIUM).format(date));out.printf("\tSHORT: %s%n",getTimeInstance(SHORT).format(date));}static void dateTimeInstanceDemo(Date date) {out.println("getDateTimeInstance() demo");out.printf("\tLONG: %s%n",getDateTimeInstance(LONG, LONG).format(date));out.printf("\tMEDIUM: %s%n",getDateTimeInstance(SHORT, MEDIUM).format(date));out.printf("\tSHORT: %s%n",getDateTimeInstance(SHORT, SHORT).format(date));}
}

package ch12;import java.text.*;
import java.util.*;public class CurrentTime {public static void main(String[] args) {DateFormat dateFormat = new SimpleDateFormat(args.length == 0 ? "EE-MM-dd-yyyy" : args[0]);System.out.println(dateFormat.format(new Date()));}
}

import java.util.*;
import java.text.*;public class Howold {public static void main(String[] args) throws Exception {System.out.print("输入出生年月日（yyyy-mm-dd）：");DateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd");Date birthDate = dateFormat.parse(new Scanner(System.in).nextLine());Date currentDate = new Date();long life = currentDate.getTime() - birthDate.getTime();System.out.println("你今年的岁数为：" +(life / (365 * 24 * 60 * 60 * 1000L)));}
}

package ch12;import static java.lang.System.out;
import java.util.Calendar;public class CalendarUtil {public static void main(String[] args) {Calendar birth = Calendar.getInstance();birth.set(1975, Calendar.MAY, 26);Calendar now = Calendar.getInstance();out.printf("岁数：%d%n", yearsBetween(birth, now));out.printf("天数：%d%n", daysBetween(birth, now));}public static long yearsBetween(Calendar begin, Calendar end) {Calendar calendar = (Calendar) begin.clone();long years = 0;while (calendar.before(end)) {calendar.add(Calendar.YEAR, 1);years++;}return years - 1;}public static long daysBetween(Calendar begin, Calendar end) {Calendar calendar = (Calendar) begin.clone();long days = 0;while (calendar.before(end)) {calendar.add(Calendar.DATE, 1);days++;}return days - 1;}
}

package ch12;import static java.lang.System.out;
import java.util.TimeZone;public class TimeZoneDemo {public static void main(String[] args) {TimeZone timeZone = TimeZone.getDefault();out.println(timeZone.getDisplayName());out.println("\t时区ID：" + timeZone.getID());out.println("\t日光节约时数：" + timeZone.getDSTSavings());out.println("\tUTC 偏移毫秒数：" + timeZone.getRawOffset());}
}