Java中的时间问题汇总
| 1.字符串转化成时间类型（字符串可以是任意类型，只要和SimpleDateFormat中的格式一致即可）: java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("M/dd/yyyy hh:mm:ss a",java.util.Locale.US); java.util.Date d = sdf.parse("5/13/2003 10:31:37 AM"); out.println(d); out.println("<br>"); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String mDateTime1=formatter.format(d); out.println(mDateTime1); out.println("<br>"); out.println(d.getTime()); 2.当前时间: Calendar cal = Calendar.getInstance(); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss G E D F w W a E F"); String mDateTime=formatter.format(cal.getTime()); out.println(mDateTime); 3.一年前日期: java.util.Date myDate=new java.util.Date(); long myTime=(myDate.getTime()/1000)-60*60*24*365; myDate.setTime(myTime*1000); String mDate=formatter.format(myDate); out.println(mDate); 4.明天日期: myDate=new java.util.Date(); myTime=(myDate.getTime()/1000)+60*60*24; myDate.setTime(myTime*1000); mDate=formatter.format(myDate); out.println(mDate); 5.两个时间之间的天数: SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date date= myFormatter.parse("2003-05-1"); java.util.Date mydate= myFormatter.parse("1899-12-30"); long day=(date.getTime()-mydate.getTime())/(24*60*60*1000); out.println(day); 6.加半小时: SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); java.util.Date date1 = format.parse("2002-02-28 23:16:00"); long Time=(date1.getTime()/1000)+60*30; date1.setTime(Time*1000); String mydate1=formatter.format(date1); out.println(mydate1); 7.年月周求日期: SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-MM F E"); java.util.Date date2= formatter2.parse("2003-05 5 星期五"); SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-MM-dd"); String mydate2=formatter3.format(date2); out.println(mydate2); 8.求是星期几: mydate= myFormatter.parse("2001-1-1"); SimpleDateFormat formatter4 = new SimpleDateFormat("E"); String mydate3=formatter4.format(mydate); out.println(mydate3); |
