Date and Time Difference

Does any body Know the API or some other alternative in VB to calculate the differnce between two system dates including time.Please Help ..

In Visual Basic, the command is

variable=DateDiff("?",firstdate,seconddate)

I hope this help

adcomp
Puerto Rico

Actually I am Begginnerin VB , Thanks for help ..Let me Try ...

variable=DateDiff("?",firstdate,seconddate)
Do i have to use something in place of "?" or just put in my field names in place of firstdate and seconddate and any Variable name .