Help with formulas with dates

[lcwilliams]

I need a formula that will calculate a certain period of time after a posted date. For example, if D1 says 06/10/08, I need E1 to calculate exactly 9 weeks after that, and F1 to calculate exactly 18 weeks after D1. Can I do that?

 

[mthompso]

I need a formula that will calculate a certain period of time after a posted date. For example, if D1 says 06/10/08, I need E1 to calculate exactly 9 weeks after that, and F1 to calculate exactly 18 weeks after D1. Can I do that?

the formula for E1: = D1 + (9*7)
the formula for F1: = D1 + (18*7)