Hi Dreams4000,
Im not sure but what I would prolly do is use the time("U"); to give you a integer of the signup date for example might be
1097523875
Then get the current time using that code which now is
1097549123
then I think you`d subtract the last by the current time which would make it
1097523875-1097549123 = 25248 seconds
Then divide that by 60, Which should give you it in minutes 420.8, Then divide it by 60 again which would be 7.01 hours, Share that by 24 which should give you if you use round() 0.3 days.
but Im sure theres prolly a simpler way. 🙂