Time difference calculation between in and out time (from biometric) of employees in excel?

I get employee in & out report from biometric. For example 18:46 as in time & 23:57 as out time in excel format.
I want to calculate difference between these 2 times in excel. Please help out me.

Dear Nissar,
Use the following procedure:
a) Select the cell. After selecting, right click your mouse
b) Select "Format Cells". When you do that, a new window emerges
c) In the new window, in the category section, select "time"
d) When we select "time", on the right side we get "types", select 1330 (or 24-hour clock time format)
e) Do this for both the windows
f) Using the subtraction formula, you will be able to calculate the time difference.
Thanks,
Dinesh Divekar

Dineshsir, Thanking you for this kind help. But when I have entry like
in time - 19:33 & out time - 00.02
this formula doesn't work. It gives result like ######
In short, I want to know any formula that works even after day changes.
Thanking in advance & hope to get any solution.

Dear Nissar,
Those are using biometric device for recording attendance for the purpose of wages calculation.They are required to use software for calculation of attendance and over time. The XL sheet calculation is difficult because:
a) Real time IN & Shift timing
b)Shift ending & real time Out
The date & time cahnge occurs in mid-night & shift duty change calculation becomes problematic.