Leberecht Maass (or Maaß) (24 November 1863 – 28 August 1914) was the "Konteradmiral" who commanded the German naval forces at the first Battle of Heligoland Bight. He lost his life when his flagship, the light cruiser SMS "Cöln" , was sunk by British battlecruisers commanded by Vice Admiral David Beatty.
David Beatty was born on August 28, 1863.
David Beatty's date of birth is never mentioned, so we don't know. It's difficult because similar information for a different person is mentioned, so the system tends to assume both pieces of information can't be true at the same time.