Here are several examples. In a theory with translational symmetry, timelike translations are not flows because in general they change the boundary conditions. However, now take the case of a simple harmonic oscillator, where the boundary points are at a separation of a multiple of the period from each other, and the initial and final positions are the same at the boundary points. For this particular example, it turns out there is a flow. Even though this is technically a flow, this would usually not be considered a gauge symmetry because it is not local.