展会与他50周年忌辰同日。

The exhibition coincides with the 50th anniversary of his death.

虽然这点看起来被卡住了，日期和忌辰宴会蛋糕上的日期不吻合。

While this seems pretty cut and dried, this date doesn't agree with the date given on the Deathday Party cake.

但是，如果他对时间概念模糊的话，那么他的忌辰舞会同样可能是不准的。

And if he's that foggy on dates, maybe his Deathday shindig was wrong too.

如果我们认可了从忌辰宴会蛋糕引出的年表，那么哈利是1994年7月告诉天狼星这件事的，还早了半年。

If we accept the timeline derived from the Deathday Party cake, Harry is telling Sirius about this incident in July of 1994, a half-year earlier.