What kinds of illegal date values are you trying to represent?  The
reason I ask is that it's not going to be as easy as subclassing
datetime... datetime is implemented in C.  and so enforcement of legal
values is going to be in the C code.  For the time.h functions, you're
also going to be constrained by the size of the time_t struct, which is
probably a long int on your platform.   See Modules/datetimemodule.c in
the Python source.

One thing you could do would be to copy datetimemodule.c and build your
own C extension type based on it... things like MAXYEAR 9999 could be
changed that way.

The other thing would be to write a pure-python datetime class without
trying to inherit datetime.datetime.

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