Grüss dich Alptraum!
1) Who has a birthday today/tomorrow/next week? OR a) Whose birthday is it (today/tomorrow/etc)?
1) I don't know who has a birthday today/tomorrow/this week. OR b) I don't know whose birthday it is (today/etc)
1) with 2) OR a) wtih b), versteht sich
It would be a bit strange to ask: Who has a birthday? The whole world would say ¡me!
Interested in Language