  We explore the finite bias DC differential conductance of a correlated
quantum dot under the influence of an AC field, from the low-temperature Kondo
to the finite temperature Coulomb blockade regime. Real-time simulations are
performed using a time-dependent generalization of the steady-state density
functional theory (i-DFT) [Nano Lett. {\bf 15}, 8020 (2015)]. The numerical
simplicity of i-DFT allows for unprecedented long time evolutions. Accurate
values of average current and density are obtained by integrating over several
periods of the AC field. We find that (i) the zero-temperature Kondo plateau is
suppressed, (ii) the photon-assisted conductance peaks are shifted due to
correlations and (iii) the Coulomb blockade is lifted with a concomitant
smoothening of the sharp diamond edges.
