Assuming:
global Date now;

The pattern "Foo( this before now )" will generate various errors.
The reason is that the Global[X]Extractors (X =
{"","Date","Number"}

are erroneously declared as self-referential extractors.
If Foo is not an @event, a CCE will arise since the operators will use
"this" rather than the global. Otherwise, the result will be inconsistent