Many scholars today consider the pastoral epistles not to have been written by Paul. They may have been written by an anonymous Christian schooled in Paul's doctrine, writing between 90 and 140.
Scholars consider the Pastoral epistles to all be written by the same author. Titus has a very close affinity with 1 Timothy, sharing similar phrases and expressions and similar subject matter. While these epistles are traditionally attributed to Paul of Tarsus, many scholars today consider them pseudepigraphical.
Scholars who believe Paul wrote Titus such as Donald Guthrie date its composition from the circumstance that it was written after Paul's visit to Crete (Titus 1:5). That visit could not be the one referred to in the Book of Acts 27:7, when Paul was on his voyage to Rome as a prisoner, and where he continued a prisoner for two years. Thus traditional exegesis supposes that after his release Paul sailed from Rome into Asia, passing Crete by the way, and that there he left Titus "to set in order the things that were wanting." Thence he would have gone to Ephesus, where he left Timothy, and from Ephesus to Macedonia, where he wrote the First Epistle to Timothy, and thence, according to the superscription of this epistle, to Nicopolis in Epirus, from which place he wrote to Titus, about 66 or 67.
The Pastoral epistles are regarded by many secular scholars as being pseudepigraphical. On the basis of the language and content of the pastoral epistles, many secular scholars today doubt that they were written by Paul, and believe that they were written after his death. Critics examining the text fail to find its vocabulary and literary style similar to Paul's unquestionably authentic letters, fail to fit the life situation of Paul in the epistles into Paul's reconstructed biography, and identify principles of the emerged Christian church rather than those of the apostolic generation.
Those scholars who consider Titus to be pseudepigraphical date the epistle from the 80s up to the end of the 2nd century.
Exegetical papers on Titus: