- 1.
- Date d1 = new Date();
- logger.info("1<{}>", d1.getTime()); // <1552463576744>
- logger.info("2<{}>", new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(d1.getTime())); // <2019/03/13 15:52:56>
- logger.info("3<{}>", new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(d1)); // <2019/03/13 15:52:56>
- Date d2 = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").parse("1970/01/01 08:00:00");
- logger.info("4<{}>", d2.getTime()); // 结果 0
- logger.info("5<{}>", new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(d2.getTime())); // <1970/01/01 08:00:00>
- Date d3 = new SimpleDateFormat("yyyy/MM/dd").parse("2019/3/10");
- d3 = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").parse("2019/3/10 22:36:01");
- logger.info("6<{}>", d3); // <Sun Mar 10 22:36:01 CST 2019>
- logger.info("d3 = <{}>", d3.getTime()); // <1552228561000>
- logger.info("d3= <{}>", new SimpleDateFormat("yyyy/MM/dd").format(d3.getTime())); // <2019/03/10>
- logger.info("7<{}>", DateUtil.getPatternDate("yyyy/MM/dd HH:mm:ss", 1552012596964L)); // <2019/03/08 10:36:36>
- logger.info("8<{}>", DateUtil.getPatternDate("yyyy/MM/dd HH:mm:ss", 1551966731871L)); // <2019/03/07 21:52:11>
- 2.
- // 用 "2018-11-28" 算出 "2018-11-21"
- String d = "2018-11-28";
- String pattern1 = "yyyy-MM-dd";
- String pattern2 = "yyyy-MM-dd HH:mm:ss";
- SimpleDateFormat sdf1 = new SimpleDateFormat(pattern1);
- SimpleDateFormat sdf2 = new SimpleDateFormat(pattern2);
- int offset = -7;
- long time = DateUtil.parseDateAddDaysToLongStrict(d, pattern1, offset); // 自定义工具 DateUtil
- String day = DateUtil.getPatternDate(pattern1, time);
- logger.info("day:<{}>", day);
- 3.
- // 用今天时间, 算出向前 7 天的日期, 方法二
- Calendar calendar = Calendar.getInstance();
- logger.info("taday 短格式:<{}>", sdf1.format(calendar.getTime())); // 短格式
- logger.info("taday 长格式:<{}>", sdf2.format(calendar.getTime())); // 长格式
- calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) + offset);
- Date tod = calendar.getTime();
- String t = sdf1.format(tod);
- logger.info("7 天前的这一天:<{}>", t);
- 4.
- // 用 Calendar 根据时区获得当天 00:00:00 的时间戳
- logger.info("当前时间戳:<{}>", System.currentTimeMillis()); // 当前时间的时间戳
- TimeZone curTimeZone = TimeZone.getTimeZone("GMT+8"); // 东 8 区
- Calendar cal = Calendar.getInstance(curTimeZone); // 当前时间, 精确到秒
- long now = cal.getTimeInMillis();
- logger.info("当前时间戳:<{}>", now); // 当前时间的时间戳
- calendar.setTimeInMillis(now);
- calendar.set(Calendar.HOUR_OF_DAY, 0);
- calendar.set(Calendar.MINUTE, 0);
- calendar.set(Calendar.SECOND, 0);
- calendar.set(Calendar.MILLISECOND, 0);
- long dayBeginning = calendar.getTimeInMillis();
- logger.info("当天开始时间戳:<{}>", dayBeginning); // 今天 00:00:00 的时间戳
- long dayEnd = dayBeginning + 86400000;
- logger.info("当天结束时间戳:<{}>", dayEnd); // 第二天 00:00:00 的时间戳
e.
来源: http://www.bubuko.com/infodetail-2986094.html