JAVA时间类

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package 时间;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.Locale;public class mycalendar {    private static int compare_date(String string, String string2) {        // 比较日期大小        SimpleDateFormat ss = new SimpleDateFormat("y-MM-dd  hh:mm");        DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm");        try {            Date dt1 = df.parse(string);            Date dt2 = df.parse(string2);            if (dt1.getTime() > dt2.getTime()) {                return 1;            } else if (dt1.getTime() < dt2.getTime()) {                return -1;            } else if (dt1.getTime() == dt2.getTime()) {                return 0;            }            return 999;        } catch (ParseException e) {            return 999;        }    }    static int days(Date x, Date y) {        long n = x.getTime() - y.getTime();        return (int) (n / (24 * 60 * 60 * 1000));    }    static int dayss(Calendar x, Calendar c) {        return x.get(x.DAY_OF_YEAR) - c.get(c.DAY_OF_YEAR);    }    public static String getWeek() {        String str[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };// 字符串数组        return str[Calendar.getInstance().get(Calendar.getInstance().DAY_OF_WEEK) - 1];    }    @SuppressWarnings("deprecation")    public static void main(String[] args) throws InterruptedException, ParseException {        Calendar x = Calendar.getInstance();        Calendar c = new GregorianCalendar();        SimpleDateFormat si = new SimpleDateFormat("y-MM-dd  hh:mm:ss", Locale.CHINESE);        c.set(2017, 8, 25, 1, 20, 21);        x.setLenient(true);// 容错性设置        System.out.println("两日期相差:" + dayss(x, c));        System.out.println(c.getTime());        System.out.println("当前系统时间:" + x.getTime());        System.out.print(x.get(Calendar.YEAR) + "年:");        System.out.print(x.get(Calendar.MONTH) + "月:");        System.out.print(x.get(Calendar.DAY_OF_WEEK) + "日:");        System.out.print(getWeek() + ":");        System.out.print(x.get(Calendar.HOUR_OF_DAY) + "时:");        System.out.print(x.get(Calendar.MINUTE) + "分:");        System.out.println(x.get(Calendar.SECOND) + "秒");        System.out.println("本年度的第几周" + x.get(Calendar.WEEK_OF_YEAR));        System.out.println("本月第几周:" + x.get(Calendar.WEEK_OF_MONTH));        System.out.println("本周第几天:" + x.get(Calendar.DAY_OF_WEEK));        System.out.println(x.getClass().getName());        System.out.println(x.getTimeInMillis());        x.set(2199, 9, 9);// 设置年月日        System.out.println(x.getTime());        x.set(Calendar.YEAR, 2000);// 设置年        x.set(Calendar.HOUR_OF_DAY, 15);// 设置时        System.out.println(x.getTime());        x.roll(Calendar.YEAR, 2);// 年数加2        x.roll(Calendar.HOUR_OF_DAY, false);// false:-1 true:+1        System.out.println(x.getTime());        x.set(2000, 9, 9);        x.add(Calendar.YEAR, 2);// 年数加2        System.out.println("当前时间:" + x.getTime());        x.set(2017, 8, 15, 12, 6, 60);// 自动进位        System.out.println(x.getTime());        System.out.println("一年中最大月份:" + x.getActualMaximum(Calendar.MONTH));        System.out.println("一年中最小 月份:" + x.getActualMinimum(Calendar.MONTH));        System.out.println("一年天数" + x.getActualMaximum(Calendar.DAY_OF_YEAR));        System.out.println("一月最大天数" + x.getActualMaximum(Calendar.DAY_OF_MONTH));        System.out.println(x.getActualMinimum(Calendar.DAY_OF_MONTH));        System.out.println(si.format(x.getTime()));// 格式化时间        c.setTime(new SimpleDateFormat("yy-mm-dd").parse("2017-10-28"));// 字符串转时间        System.out.println(si.format(c.getTime()));        c.set(Calendar.DATE, Calendar.DATE + 1);// 天数减一        System.out.println("后一天:" + si.format(c.getTime()));        System.out.println(System.nanoTime() / 1000 / 1000 / 1000 / 60 / 60 / 24 / 365);        System.out.println("当前时间距离1970年年数:" + System.currentTimeMillis() / 1000 / 60 / 60 / 24 / 365);        c.setTime(Calendar.getInstance().getTime());        System.out.println("当前时间:" + si.format(c.getTime()));        c.add(Calendar.MONTH, -2);        System.out.println("当前时间:" + si.format(c.getTime()));        // *****计算某年某月多少天********        int nowYear = 1995;        c.set(Calendar.YEAR, nowYear);        c.set(Calendar.DATE, 1);        for (int i = 0; i < 11; i++) {            c.set(Calendar.MONTH, i);            System.out.println(nowYear + "年" + (i + 1) + "月" + c.getActualMaximum(Calendar.DATE));        }        int i = compare_date("2017-07-21 15:21", "2017-07-21 15:22:99");        System.out.println("i==" + i);        System.out.println("两日期相差天数" + days(new Date(2017, 7, 21), new Date(2017, 8, 21)));    }}
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