Zero date as a Constant?

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Hello all!

It seems to be impossible to define a zero date as a constant. Of course I know a workaround, but I wonder why …

define data local
01 #zero-time (T) const <0> /* works
01 #zero-date (D) const <0> /* doesn't work
01 #zero-date2 (D) const <D'0000-01-02'> /* doesn't work
01 #zero-date3 (D) const <D'00-00-00'> /* doesn't work
end-define
end

Regards

Matthias