'Day' in the Bible

in view of your participation in the gospel from the first day until now.

For I am confident of this very thing, that He who began a good work in you will perfect it until the day of Christ Jesus.

so that you may approve the things that are excellent, in order to be sincere and blameless until the day of Christ;

holding fast the word of life, so that in the day of Christ I will have reason to glory because I did not run in vain nor toil in vain.

circumcised the eighth day, of the nation of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; as to the Law, a Pharisee;