Java时间类Date类和Calendar类的使用详解
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
public void testDate() { //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:
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我们网站的支持!
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