+1 zag.
It was stated by a mod and confirmed here.
My short version of it is,
"The first shot of the first game started on the new CDP day (that is, after 12 pm GMT) immediately transfers the CDP bonus XPs to the player (and CC, if a pass is involved)"
From my experience of nine CDPs, it works 100% for solo strokeplay, even when the games are quit.
Problems are being reported for A/S and perhaps other MP games. From my text above, I'm guessing that it might be caused by the fact that only one player has "the first shot" and the others don't. I'm not into MP games any more, but if I'm right, the inviting player would get the CDP bonus and the others wouldn't. They'd have to play an extra shot by themselves.