I am unsure as to if there is a class out there to do integration. I would suggest using Remiann sums and limits with ever increasingly small delta values. You will be able to get a close approximation for the integral. If anyone knows of calss to do differentiation and integration please comment on this. Thanks

You are correct. - Nick Parker My Blog | My Articles

Chris is right, try to make the structure in your database hold a DateTime object and not a string. If you try to query the database for dates using comparisons other than equals, you'll get unexpected results since it'll be returning rows based on the STRING value of the datetime, not the actual datetime. Good luck!

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thanks that help me alot ADEL K Khalil