 A common claim that appears in many discussions of the problem of time (especially amongst philosophers) is that it is restricted to canonical formulations of general relativity, and has something to do with the Hamiltonian formalism (see Rickles 2008a, pp. 340–1 for more details). The confusion lies in the apparently very different ways that time is treated in general relativity as standardly formulated, and as it appears in a canonical, Hamiltonian formulation. In the former there is no preferred temporal frame, whereas the latter appears to demand such a frame in order to get off the ground (cf. Curiel, 2009, p. 59; Tim Maudlin (2004) tells a broadly similar story).