Subtracting Values of Time

[BillyGoatsGruff]

I am making a user form to log in and log out students in a program. They choose and event and an event type then login. The time stamp that they log in as is represented in a cell. They then come back to the user form when they are done and log out. I need to subtract the log in value and the log out value to get a total time at the event. I will use that time and add it to the main spread sheet which shows all the students and the events they went to.

Here is the code so far:

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The Part I am working with is in bold, Private Sub Calculate Time

[Kaper]

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this could lead to serious errors (If you count time not only in whole days).

Not seeing the spreadsheet it is not easy to guess what is real problem, but see this:

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