The baptism of Christ is celebrated on the first Sunday after January 6. That is on a date between 7 and 13 of January inclusive. This year is celebrated on January 13, 2019. John the Baptist, a saint, lived in the wilderness of Judea he preached repentance and said to the people: "I indeed baptize you with water unto repentance, but He who is coming after me is mightier than I, whose sandals I am not worthy to carry. He will baptize you with the Holy spirit and fire." referring to Jesus. When John saw Jesus coming toward him John said: "Behold! The Lamb of God who takes away the sin of the world!" Saint John the Baptist said to Jesus: "I need to be baptized by You and You are coming to me?" Jesus replied: "Permit it to be so now, for thus it is fitting for us to fulfill all righteousness."
A baptism consists of the release of every evil energy and sin and the filling with the Holy Spirit. Jesus did not sin He is God. As soon as Jesus was immersed in the water He rose indicating that He is God (Matthew 3:16). At the baptism of Jesus the Holy Trinity appeared: The voice of God saying: "This is my beloved Son in whom I am well pleased." The Holy Spirit descended upon Jesus like a dove.
Jesus Christ is God He did not need to be baptized. Jesus is God-Human. As Human He was baptized to show us what to do. He was baptized to fulfill the scriptures. When He was born as a human, being a God, He sanctified all humans. Jesus when He was baptized He sanctified the sacrament of baptism.