Visual Basic 2008 difference calculating

[rubecuber]

How do I make a a program in vb 2008 calculate the difference between the first thing, and then the last thing entered?

For example, I tabulate the amount of balloons Jim has versus the day of the month, and I want to see the difference between day 1 and the last day I entered. This is for vb2008

Thanks!

[Disch]

You might have better luck asking this question on a Visual Basic forum and not a C++ forum. They are completely seperate and unrelated languages, after all.