Ordinary Time after the Baptism: Monday after the Feast of the Baptism through Shrove Tuesday
After the celebration of the Feast of the Baptism of the Lord, Ordinary Time begins. Ordinary does not mean plain. The name comes from “ordinalis” meaning "showing order, denoting an order of succession.” It is used in this sense to refer to the order of the counted weeks. That is to say, it is a season of counted weeks.
Ordinary Time after the Baptism focuses on the early life and childhood of Christ, and then on His public ministry. The liturgical color of Ordinary Time is green; however, as in all seasons, other appropriate colors are worn on particular feast days. (For example, white is typically worn for Marian feast days, except in some Spanish countries where blue is an approved liturgical color.)
Ordinary Time after Pentecost: The day after Pentecost through the final day before Advent
The second period of Ordinary Time is the longest liturgical season. Ordinary Time resumes after Pentecost and runs until the final Saturday before Advent. This period of Ordinary Time focuses on Christ’s reign as King of kings, and on the age of the Church.
This is the age we live in now, which is the time between the age of the Apostles and the age of Christ’s second and final coming for which we are ever preparing. The final Sunday in Ordinary Time is the Feast of Christ the King; the Saturday after this feast is the final day of Ordinary time.
Again, the liturgical color of Ordinary Time is green; however, as in all seasons, other appropriate colors are worn on particular feast days.