The birth-certificate of Prince Philip, in Greek
You may notice the Windsor Castle in english - it is mentioned where Princess Alice was born.
It is also mentioned, among other things, that Philip's godparents were HRH Queen Mother Olga and the Corfu's local authorities!!!! (I'm not sure I understood correctly this part, because of the handwriting)
The document is signed by the mayor of Corfu in November 3rd, 1921.
The newborn baby was presented to the priest who documented the birth in October 24th, of that year and he was born in May 28th - according to the previous Julain calendar. So, I suppose that all the dates in the documents are in accordance with the julian calendar.