I am 100% certain that the date and time are successfully pushed to the mount. There is a visual display on the hand box of the date and time that the mount is receiving as ACP connects.

At the start of the session before taking sky flats I have used the console to make the scope slew to an object (even though it is invisible because of the light). I did this to check out that it slews correctly, which it does (RA and Dec are correct). It slews each time I have tried it but then it will not subsequently slew to the sky flat position when autoflat.vbs is run. I have not tried slewing just using the hand box mainly because I do not think I have pressed a button on the hand box for years relying on ACP as my source of interaction with the mount and scope.