For the former, see
A synchronology check of the date June 7, 2023, in this journal yields
an account of a sin allegedly committed by author Susan Sontag . . .
A biographer accuses her of falsifying, by two years, the date of a
meeting with Thomas Mann in his Pacific Palisades home. There may,
of course, have been more than one such meeting — once in 1947,
as described much later in detail by Sontag in a New Yorker piece, and
again in 1949, as noted privately at the time by Sontag in her journal
and by Mann himself in his diary. But the thoroughness of the biographer's
research makes this seem unlikely.