Games' dates are mostly in P(S)T while CDP counts in GMT, seven hours apart. Thus, the game dates aren't significant to the CDP, but the CDP clock and the check mark of "played" and "played not" are.
Concerning the CDP streak, a habitual time of play is valuable.
@Ron, remember that it's only a game and that CC levels are of little importance - all the more so for your L8 CC with a seemingly inactive owner.
Have fun!