: A finite-time computable function is a partial function from to whose value is constructed by concatenating a finite list with a suffix of the argument. A finite-time computability preserving conversion : X Y for X, Y is a bijection which preserves finite-time computability. We show that all the finite-time computability preserving conversions with the domain are extended sliding block functions. Key Words: Finite-time Computable Functions, Constant-time Computable Functions, Sliding Block Functions, Computable Analysis, Domain Theory.