My car here in Denmark

Well, SKAT says:

(When you are resident in Denmark, you are not allowed to use a vehicle registered abroad. You also have residence in Denmark if you for instance stay in this country for a year or more, or if you have resided here in 365 days in the last 24 months.) Når du tager et køretøj på udenlandske nummerplader med til Danmark

and

(A person coming to Denmark for a temporary period of up to one year may apply for a license to drive a foreign registered vehicle during his stay in Denmark.

Exceeds the stay one year or 365 days within a period of 24 months, must the vehicle be registered in this country or be driven out again.) Ansøgning om tilladelse til kørsel i Danmark med udenlandsk registreret køretøj

so I guess they will

But according to Commission interpretative communication on procedures  for the registration of motor vehicles originating in another Member State

it is 185 days per year:

So I am not sure EU would agree with SKAT!

(Article 7 respective article 6 says:

General rules for determining residence

1. For the purposes of this Directive, "normal residence" means the place where a person usually lives, that is for at least 185 days in each calendar year, because of personal and occupational ties, or, in the case of a person with no occupational ties because of personal ties which show close links between that person and the place where he is living.

However, the normal residence of a person whose occupational ties are in a different place from his personal ties and who consequently lives in turn in different places situated in two or more Member States shall be regarded as being the place of his personal ties, provided that such person returns there regularly. This last condition need not be met where the person is living in a Member State in order to carry out a task of a definite duration. Attendance at a university or school shall not imply transfer of normal residence.

2. Individuals shall give proof of their place of normal residence by any appropriate means, such as their identity card or any other valid document.

3. Where the competent authorities of the Member State of importation have doubts as to the validity of a statement as to normal residence made in accordance with paragraph 2, or for the purpose of certain specific controls, they may request any additional information or evidence.)