Calculating difference in time

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I need to print something out every 50 seconds. I figured I would calculate that 50 seconds had passed by subtracting my current time from the previous time.

Let's say I know the hour, minute and seconds of the previous and current time, how do I calculate how much time had passed in seconds?

I'm using C

Posted 19-Nov-11 19:18pm

CSLexy

Updated 19-Nov-11 19:47pm

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RaisKazi 20-Nov-11 1:19am

Which Technology?

Sergey Alexandrovich Kryukov 20-Nov-11 20:43pm

Language is not enough. Please, platform, libraries you want to use, other relevant detail.
--SA

4 solutions

Solution 2

Calculations do not help. You really need either a timer of a sleep state of a current thread, this way you can avoid spin-wait and wasting CPU time. You can do it the way the OS switches off your thread and don't schedule it back to execution until it is awaken by a timeout to continue execution. This is just a basic idea, and the API depends on your platform and/or libraries you might use.

Too bad you did not provide essential details.

—SA

Posted 20-Nov-11 14:47pm

Sergey Alexandrovich Kryukov

Solution 4

Dear CSLexy u are using C then use delay(t) function of header file dos.h and there t in delay function for50 second is 50000.

Posted 17-Feb-12 6:13am

Pradeep yaduvanshy

Solution 1

If you are using .Net, use the TimeSpan class to calculate the difference in seconds.
This[^] is a good example that should give you enough ideas to proceed.

Posted 19-Nov-11 19:44pm

Abhinav S

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CSLexy 20-Nov-11 1:47am

I'm using C

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CSLexy · Accepted Answer · 2011-11-21T20:17:00

Thanks for the answers. Here's what I did.

I used a modified version of an answer someone else gave me:

( (Cur_hour - Prev_hour)*3600) + ((Cur_min - Prev_min)*60) + (cur_sec - Prev_sec).

I was using C, so I calculated the difference by:
(cur_hour *3600)+(cur_min*60)+(cur_sec) - (prev_hour * 3600) + (prev_min*60)+(prev_sec).