No match for operator != (operands types are pointer and object)

I'm overloading both == and != operators and want the latter to refer to the former in order to not repeat any code at all. This is what I have written:

bool Date :: operator == (const Date & other) const {
    bool are_equal = Year() == other.Year();

    for (int i=0; i<other.NumEvents() && are_equal; i++)
        are_equal = this[i] == other[i];

    return are_equal;
}

bool Date :: operator != (const Date & other) const {
    return !(this == other);
}

The big problem here is that this is not a Date but a Date*. Is there a way to refer to this Date without a pointer or using this along with other Date?