DateField is not supported

[yuanxu-li]

I understand we can still defined a DateField using serpy.MethodField(), but it would be handy to have one already.

[clarkduvall]

I would recommend creating a subclass of serpy.Field(), and overriding the to_value method. This will allow you to use it just like any other field, and reuse it in other serializers instead of having to define a MethodField in each one.

[pawelad]

I think both DateField and DatetimeField really should be supported out of the box.

I ended up implementing my own that just call .isoformat() - if you think that's good enough solution then I'd be happy to make a pull request to add them the project.