InfoPath Dev

Good morning,

 I wonder if someone can help me with this:

 I am creating a room booking form, and I have 'start date' and 'end date' of which I am able to get the time calculations.  What I am struggling with is then how to get the cost for that time.  For example:

Start time = 9.00am

End time = 10.15 am

cost of room hire is £13.50 per hour

Would anyone be able to help me with that calculation?

Many thanks

Claire 

 Here's a blog post that may help you calculate the time difference - InfoPath doesn't have a function for this, so the calculations can be pretty complex.

 Hi Hilary,

 Many thanks for this.  I have managed to do the time calculations, it's really the 'cost' I'm struggling with - i.e. if the room is booked for 1 1/2 hours and the charge is 12.50 per hour how can I do a calculation based on the time difference x the room cost?

Thanks