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Diffrenece between two given times...

Rekha Anand
Ranch Hand

Joined: Feb 23, 2008
Posts: 36
What will be the logic behind finding the difference between two given times in military format? For egs how can i find the number of hours and minutes between 1730hrs and 0900hrs?

Here is what i guessed....
int startTime = 1730;
int endTime = 900;
int diff = (2400 -1730) + 900; // result was 1570; should be 1530.

Please tell me whatz wrong.

Thanks for your time and consideration.
[ February 23, 2008: Message edited by: Rekha Anand ]
Henry Wong

Joined: Sep 28, 2004
Posts: 20135

Basically, straight addition/subtraction can't be done with the representation that you used. And the reason is because the time representation isn't linear.

For example, 859 and 900 should be 1 minute apart. Yet, if you subtract it, you won't get 1.


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
Rekha Anand
Ranch Hand

Joined: Feb 23, 2008
Posts: 36

But then how do I solve it?
marc weber

Joined: Aug 31, 2004
Posts: 11343

Consider the time represented by "1730." Do you have one-thousand seven-hundred thirty of anything? Not really. But you do have (17 * 60) + 30 of something.

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It is sorta covered in the JavaRanch Style Guide.
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