How to calculate time difference _jsp programming under the JSP

<%@ page contenttype= "text/html;charset=gb2312"%>

<%@ page import= "java.text.*"%>

<%@ page import= "java.util.*"%>

<%

The string is converted to a time type (the string can be any type, as long as it is consistent with the format in SimpleDateFormat)

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 ());

Out.println ("<br/>");

Current time

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 A E F");

String Mdatetime=formatter.format (Cal.gettime ());

Out.println (Mdatetime);

Out.println ("<br/>");

Date 1 years ago

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 ("<br/>");

Tomorrow's date

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 ("<br/>");

Number of days between two times

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 ("<br/>");


Plus half an hour.

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 ("<br/>");


Date of month and week

SimpleDateFormat formatter2 = new SimpleDateFormat ("yyyy-mm F E");

Java.util.Date date2= formatter2.parse ("2003-05 5 Friday");

SimpleDateFormat Formatter3 = new SimpleDateFormat ("Yyyy-mm-dd");

String Mydate2=formatter3.format (DATE2);

Out.println (MYDATE2);

Out.println ("<br/>");

The day of the week

Mydate= myformatter.parse ("2001-1-1");

SimpleDateFormat formatter4 = new SimpleDateFormat ("E");

String Mydate3=formatter4.format (mydate);

Out.println (Mydate3);

Out.println ("<br/>");

%>
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Another kind
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 ()//convert String to TIME
Long L2=df.parse (STR2). GetTime ();
Long l3=0;//time interval
if (L1&GT;L2)//Judgment time successively
{
L3=L1-L2;
}else
{
L3=L2-L1;
}
l3=l3/(60*60*24*1000);
System.out.println (str1+ "and" +str2+ "separated" +l3+ "Days!");
}
}