expiration date on published file

I tried adding 10 to the CurrentDate variable and that worked. However, if I am thinking this through correctly, somehow I need to keep the date that the system looks at stagnant (the start date). For example, if I want my program to expire on November 1, 2006 - I create a variable ExpirationDate and add 35 to the CurrentDate (November 1 is 35 days from today's date). However, if the user goes into the program tomorrow, the CurrentDate will now be September 27, so the expiration date shifts to November 2. I am not an expert with variables, but can I create one to add 35 days from a certain date (or some sort of starting point), and not use the CurrentDate variable?I tried adding 10 to the CurrentDate variable and that worked. However, if I am thinking this through correctly, somehow I need to keep the date that the system looks at stagnant (the start date). For example, if I want my program to expire on November 1, 2006 - I create a variable ExpirationDate and add 35 to the CurrentDate (November 1 is 35 days from today's date). However, if the user goes into the program tomorrow, the CurrentDate will now be September 27, so the expiration date shifts to November 2. I am not an expert with variables, but can I create one to add 35 days from a certain date (or some sort of starting point), and not use the CurrentDate variable?