'Day' in the Bible

because of your participation in the gospel from the first day until now,

convinced of this same [thing], that the one who began a good work in you will finish [it] until the day of Christ Jesus,

so that you may approve what is superior, in order that you may be sincere and blameless in the day of Christ,

holding fast to the word of life, for a source of pride to me in the day of Christ, that I did not run in vain or labor in vain.

{circumcised on the eighth day}, from the nation of Israel, of the tribe of Benjamin, a Hebrew [born] from Hebrews, according to the law a Pharisee,