John Gill Commentary Genesis 1:23

"And there was evening and there was morning, a fifth day." — Genesis 1:23 (ASV)

And the evening and the morning were the fifth day .
] The sun now in the firmament, where it was fixed the day before, having gone round the earth, or the earth about that, in the space of twenty four hours; and according to Capellus this was the twenty second of April; or, as others, the fifth of September; and according to Bishop Usher the twenty seventh of October.