St. Thomas Day is observed in rememberance of Saint Thomas, one of the twelve Apostles according to the New Testament of the Bible. Although the Feast of St. Thomas the Apostle was established in the twelfth century which was celebrated on December 21, now the date of observance has been changed. While the Roman Catholic Church moved Thomas’s Day to July 3, some Anglicans observe it in December. St Thomas Day 2020 falls on July 3.