Return value of formulated cell based on another value

[DancingIsForbidden]

Hi there

I'm querying the possibility of being able to retrieve the absolute value of a formula once a TODAY() formula reads a particular date. I've attached an example of what I'm working on,

So once the date hits 19/09/2014. O3 will retrieve an absolute value from N3 which is reading from a separate worksheet and will continue to change, however O3 in theory will not change. This is all to calculate how much data has been placed in a worksheet on a daily basis.