Date: A.D. 51-52
Both 1 and 2 Thessalonians were written from Corinth during the apostle’s eighteen-month stay in that city (cf. Acts 18:1-11). The first epistle was written during the earlier part of that period just after Timothy had returned from Thessalonica with news of the progress of the church. The second letter was dispatched just a few weeks (or at the most a few months) later. Any date assigned will have to be approximate, though probably A.D. 51-52.