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在JSP下如何计算时间差
<%@ page contentType="text/html;charset=gb2312"%> <%@ page import="java.text.*"%> <%@ page import="java.util.*"%> <% //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("
"); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String mDateTime1=formatter.format(d); out.println(mDateTime1); out.println("
"); out.println(d.getTime()); out.println("
"); //当前时间 Calendar cal = Calendar.getInstance(); // SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 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); out.println("
"); //1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); out.println("
"); //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); out.println("
"); //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); out.println("
"); //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); out.println("
"); //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); out.println("
"); //求是星期几 mydate= myFormatter.parse("2001-1-1"); SimpleDateFormat formatter4 = new SimpleDateFormat("E"); String mydate3=formatter4.format(mydate); out.println(mydate3); out.println("
"); %> =========================== 另一种 import java.text.DateFormat; import java.text.ParseException; import java.util.Date; class test { public static void main(String[] args) throws ParseException { DateFormat df=DateFormat.getDateInstance(); String str1="2002-3-4"; String str2="2002-7-12"; long l1=df.parse(str1).getTime();//把字符串转化为时间 long l2=df.parse(str2).getTime(); long l3=0;//时间间隔 if(l1>l2)//判断时间先后 { l3=l1-l2; }else { l3=l2-l1; } l3=l3/(60*60*24*1000); System.out.println(str1+"与"+str2+"相隔"+l3+"天!"); } }