Many of the 'cheats' (or console commands as I prefer to call them) can't actually be activated through the RomeShell console. The good news, however, is that they can be activated through a script.
Have a read of this Beginner's Guide to Scripting and follow those steps. There's a link as to how to change the date at the bottom of the first post.
Of course, if you don't want to bother, you can always read the message below:
Spoiler Alert, click show to read:
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