Clement of Alexandria Seems to Emphasize that the 'Thirty' Were Completed With Jesus' Crucifixion

And Jesus was coming to His baptism, being about thirty years old," and so on. And that it was necessary for Him to preach only a year, this also is written: "He hath sent Me to proclaim the acceptable year of the Lord." This both the prophet spake, and the Gospel. Accordingly, in fifteen years of Tiberius and fifteen years of Augustus; so were completed the thirty years till the time He suffered. [Clement Stromata i.21]