Liturgical Calendar Calculator (Catholic Season, Week, Color and Year A, B or C)

How it works

Liturgical year starts on the 1st Sunday of Advent (the Sunday from Nov 27 to Dec 3) · Sunday cycle: year in which the liturgical year ends ÷ 3 → remainder 1 = Year A, 2 = Year B, 0 = Year C · weekday cycle: odd year = I, even year = II · Christmas Time ends with the Baptism of the Lord · Lent = Ash Wednesday (Easter − 46) to Holy Thursday · Easter Time = Easter to Pentecost (Easter + 49) · Ordinary Time weeks after Pentecost are counted back from Christ the King = week 34

The Roman Catholic liturgical year follows the General Norms for the Liturgical Year and the Calendar (1969): Advent, Christmas Time, Ordinary Time, Lent, the Easter Triduum and Easter Time, then Ordinary Time again until Christ the King. Sunday Mass readings rotate on a three-year cycle (A: Matthew, B: Mark, C: Luke) and weekday readings on a two-year cycle (I and II). Movable dates come from Easter, and the Epiphany option covers countries such as the United States, Mexico and Colombia, where Epiphany is moved to a Sunday and the Baptism of the Lord can fall on a Monday. Feasts of saints and local solemnities can change the color of a particular day.

Worked example

Thursday, October 8, 2026 belongs to the liturgical year that began on the First Sunday of Advent, November 30, 2025, and ends on November 28, 2026 (the next Advent starts November 29). Pentecost was May 24, so the Sunday before, October 4, was the 27th Sunday in Ordinary Time and October 8 is Thursday of Week 27 in Ordinary Time: season Ordinary Time, color green, Sunday readings Year A (Matthew) and weekday readings Year II. Christ the King falls on November 22, 2026.

Sources: General Norms for the Liturgical Year and the Calendar (Vatican, 1969) · USCCB — Liturgical Year

Frequently asked questions