'Day' in the Bible

because of your partnership in the gospel from the first day until now.

I am convinced of this, that the one who began a good action among you will bring it to completion by the Day of the Messiah Jesus.

so that you may be able to choose what is best and be pure and blameless until the day when the Messiah returns,

Having been circumcised on the eighth day, I am of the nation of Israel, from the tribe of Benjamin, a Hebrew of Hebrews. As far as the Law is concerned, I was a Pharisee.