My =TEXT won't work. It doesn't show months or years. I have downloaded the example template from the support page of Microsoft but I can't make it work. It does show days, which is weird. It doesn't matter which file or sheet I try, same result.
I have tried to change the number formats and reinstalled Excel, without progress. I don't know what is wrong.
See the second comment in the answer to this question:
Formating a date in excel when combining text from multiple cells
I'm not sure about months, but try ÅÅÅÅ instead of YYYY. You can try hitting ctrl+1, selecting "Custom" from "Category" in the "Number" tab. Scroll down until you get to starter codes for date formatting. That may show you what code is needed for TEXT
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You say you are using the English version, but your screenshot is showing torsdag instead of Saturday.