On Wednesday, 26 May, my post, A Chesterton Calendar, indicated that it was St Augustine of England's Day. Yesterday evening, as I was preparing the posts that I share at midnight, I noticed that the entry on In Lumine Fidei for today, the 28th, was St Augustine of Canterbury's Day. Huh?
Since they were both the same Saint, I was confused. So, being the curious sort I am, I did some research. It turns out they are BOTH correct! Not only that, but yesterday, the 27th, was also a St Augustine's Day!
It all depends on which Rite or Use you are following. The 26th is, indeed, St Augustine's Day if you are an Eastern Rite Catholic or a member of the Anglican Ordinariate. If you are a Roman Rite Traditionalist such as the authoress of In Lumine Fidei, today is the Feast of St Augustine.
And if you follow the Novus Ordo Calendar of 1969, his Feast falls on 27 May. So, yes, St Augustine has three Feast Days, one after the other.