CODEWITHSUNDEEP
java
harishtps
harishtps

Reputation: 1439

Difference in time between two dates in java

I have to find the difference in time between two different date objects in java and if that time exceeds 5 sec i have to invalidate the session.

Here's the scenario :

I have a jsp page which set the session every 5 sec 

session.setAttribute( "sessionAccessedAt", new Date() );

I have a another jsp page which is accessed every 1 sec ,

Date date2 = new Date();

Now i have to compare in the another jsp that i have mentioned and invalidate the session,

Date date1 = (Date)session.getAttribute("sessionAccessedAt");
Date date2 = new Date();

Differnce = date2 - date1;

Thereby if the difference exceeds 5 sec, invalidating the session.

Upvotes: 28

Views: 55712

Answers (4)

Dhruv Saksena
Dhruv Saksena

Reputation: 219

From Java-8 onwards you may use-

ChronoUnit.DAYS.between(startDate.toInstant(), endDate.toInstant());

This is a generic Enum using which, it becomes pretty simple to find difference in any Unit.

Upvotes: 4

Jon Onstott
Jon Onstott

Reputation: 13727

Building on the other answers, java.util.concurrent.TimeUnit makes it very easy to convert between milliseconds, seconds, etc...

 long differenceInSeconds = TimeUnit.MILLISECONDS.toSeconds(date2.getTime() - date1.getTime());

Upvotes: 9

JB Nizet
JB Nizet

Reputation: 691735

if ((date2.getTime() - date1.getTime()) > 5000) { // getTime returns the time in milliseconds
    // invalidate
}

But the session timeout is supposed to be handled by the container, not by you.

PS : this is easily answered by reading the javadoc : http://download.oracle.com/javase/6/docs/api/index.html

Upvotes: 9

planetjones
planetjones

Reputation: 12633

   long difference = date2.getTime() - date1.getTime();

    // now you have your answer in milliseconds - 
//so divide by 1000 to get the time in seconds

Upvotes: 69

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