Time difference problem

[gm199]

Hi all, I made a script that give me the hour:minutes of the beginning of the event and the hour:minutes of the end.
Now I need to calculate the time difference between those times.
Ie:
Begins at 6:53
Ends at 19:02
Duration: ??:?? #(must show 12:09)

In this case I change it to minutes and divided by 60 but since minutes 02 is < then 53, i got a negative number.

Any clue on how to perform the math without any additional package?

 

[MikeLacey]

Are you storing the times as the values you would get back from gmtime()? If you are you are storing the number of seconds since some time or other...

So -- you can take one time from the other and get the number of seconds

Divide to get days
divide remainder to get hours
=======||============== minutes
what's left is seconds
Mike
________________________________________________________________

&quot;Experience is the comb that Nature gives us, after we are bald.&quot;

Is that a haiku?
I never could get the hang
of writing those things.

 

[gm199]

No, the time is provided by a routine that caalculates the sunnrise and sunshine.
Here is the partial uglly code I'm getting in trouble:

#Sunrise = 6:53
#Sunset = 19:02

($hh,$mm) = split(/:/, $sunrise);
$in = (($hh*60)+$mm);

($ho,$mo) = split(/:/, $sunset);
$out = (($ho*60)+$mo);

$vv =(($out - $in)/60);

$dia = ($sunset - $sunrise);
($hs,$ms)=split(/\./,$vv);
$vf = ($vv-int($dia));
$vf =~ s/-//; # stupid, I know

$m2 = int($vf*60);

if ($m2 < 10){ $mif = &quot;0&quot;.$m2; }
else{ $mif=$m2; }

print &quot;Hours of sunshine &quot; .$hs . &quot;:&quot; . $mif . &quot;<br>&quot;;