Oh Happy Day is a hymn written in the mid-18th century ("Oh happy day that fixed my choice") by English clergyman Phillip Doddridge (based on Acts 8:35) set to an earlier melody (1704) by J. A. Freylinghausen. By the mid-19th century it had been given a new melody by Edward F. Rimbault and was commonly used for baptismal or confirmation ceremonies in the UK and USA. Watch, fight, pray, and live rejoicing every day. Difficult to learn in troubled times; always good to do.