January 28 is Aquinas’s liturgical feast according to the calendar of Paul VI. On that date in 1369 Aquinas’s relics were translated to the Dominican church in Toulouse.
March 7 is Aquinas's liturgical feast according to the pre-Pauline calendar of the Roman Rite. Aquinas died on that date in 1274 at the abbey of Fossanova, where he had stopped after taking ill on his way with Reginald of Piperno to the second Council of Lyons.
Both calendars are still in force in the Roman Rite. So, we (or I, at least) celebrate Aquinas's feast twice.