When i use different functions to roken with time, seconds etc. i get 
incorrect results, if some time is over 24 hours. 

For example:

Type in 11:59 an 11:59 in two cells and let is sum. And then let give you the 
hour out of it =HOUR(A3) (in german: =STUNDE(A3) -> It's correct.

Type in 12:01 an 11:59 -> 24:00:00 -> you get 0 as hour

Type in 14:30 an 11:59 -> 26:29:00 -> you get 2 as hour


Cals sets every 24 hours at 0. This is extremly bad, if you have to roken with 
it. I want to sum my training hours. Some time i have more than 24. For 
example 32:24:47. I can sum this up correct, but i can't do further functions. 
For example hour(). I have tried to roken the percent out of it, but therefore 
i get wrong results when i come over 24 hours. I get 400% and so on...

Sorry, i can't describe it better in english. For further questions i try to 
explain it better. Please contact me. 

I have had this problems more times, because i try to make a big spreadsheed 
for the whole year and i make more functions with time. the others i was able 
to resolve by format the cell, but i would have need other formats. I just 
take what makes correct results. Tahnk you!