起因:写代码的时候经常会用到获取当前时间戳和日期,现总结如下
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//SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");//设置日期格式 Date date = new Date(); String dateString = date.toString(); long times = date.getTime(); System.out.println( "date.toString():" +date.toString()); System.out.println( "当前时间戳(毫秒):" + times); Calendar c = Calendar.getInstance(); System.out.println( "当前日期:" + c.get(Calendar.DATE)); System.out.println( "当前年份:" + c.get(Calendar.YEAR)); //月份从0开始,0-11 System.out.println( "当前月份:" + c.get(Calendar.MONTH)); //12小时制,0-11 System.out.println( "12小时制:当前小时:" + c.get(Calendar.HOUR)); System.out.println( "24小时制:当前小时:" + c.get(Calendar.HOUR_OF_DAY)); System.out.println( "当前分钟:" + c.get(Calendar.MINUTE)); System.out.println( "当前秒:" + c.get(Calendar.SECOND)); System.out.println( "一年中的某天:" + c.get(Calendar.DAY_OF_YEAR)); System.out.println( "当前时间戳(毫秒):" + c.getTimeInMillis()); System.out.println( "Calendar的toString()方法一般用作调试:" +c.toString()); SimpleDateFormat df = new SimpleDateFormat( "yyyyMMdd" ); String currentDateStr = df.format( new Date()); System.out.println( "当前日期yyyyMMdd:" +currentDateStr); } <br><br> |
输出结果:
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date.toString():Wed Aug 02 11 : 39 : 05 CST 2017 当前时间戳(毫秒): 1501645145298 当前日期: 2 当前年份: 2017 当前月份: 7 12 小时制:当前小时: 11 24 小时制:当前小时: 11 当前分钟: 39 当前秒: 5 一年中的某天: 214 当前时间戳(毫秒): 1501645145302 Calendar的toString()方法一般用作调试:java.util.GregorianCalendar[time= 1501645145302 ,areFieldsSet= true ,areAllFieldsSet= true ,lenient= true ,zone=sun.util.calendar.ZoneInfo[id= "Asia/Shanghai" ,offset= 28800000 ,dstSavings= 0 ,useDaylight= false ,transitions= 19 ,lastRule= null ],firstDayOfWeek= 1 ,minimalDaysInFirstWeek= 1 ,ERA= 1 ,YEAR= 2017 ,MONTH= 7 ,WEEK_OF_YEAR= 31 ,WEEK_OF_MONTH= 1 ,DAY_OF_MONTH= 2 ,DAY_OF_YEAR= 214 ,DAY_OF_WEEK= 4 ,DAY_OF_WEEK_IN_MONTH= 1 ,AM_PM= 0 ,HOUR= 11 ,HOUR_OF_DAY= 11 ,MINUTE= 39 ,SECOND= 5 ,MILLISECOND= 302 ,ZONE_OFFSET= 28800000 ,DST_OFFSET= 0 ] 当前日期yyyyMMdd: 20170802 |
总结
以上所述是小编给大家介绍的Java时间类Date类和Calendar类的使用详解,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:http://www.cnblogs.com/zhaijing/archive/2017/08/02/7273013.html