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compare two dates thru Calendar

kri shan
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Joined: Apr 08, 2004
Posts: 1383
How can i compare two dates thru Calendar ? one is System date and another is Util date. Date format is MM-dd-yyyy:hh:mm:ss
Jesper de Jong
Java Cowboy
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Joined: Aug 16, 2005
Posts: 14489
    
  23

What do you mean with "one is System date and one is Util date"? There is a Date class in package java.util. Do you mean that you have a java.util.Date object and you want to compare it to the current system date?

You can do that like this:

- Get two Calender objects using the Calendar.getInstance() method.
- Set one of the two to the Date object that you have by using the setTime() method.
- Use the before() or after() methods to compare the Calendars.

Lookup the API documentation of java.util.Calendar for more details.


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Scott Selikoff
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Joined: Oct 23, 2005
Posts: 3738
    
  10

One common way to compare dates (not neccessarily the best but probably the most often used way) is to convert them into their long values after the epoch using such as:

Calendar cal = Calendar.getInstance();
Date date = cal.getTime();
long time = date.getTime();

Once you have long value in milliseconds you can just compare/compute them as numbers.

As long its not the year 2038, you'll be fine.

-Scott


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