Are Sundays part of Lent? This question often arises because of the custom (mentioned in Part I) of many people giving themselves a break from penance on Sundays in Lent.
The answer is yes, Sundays are part of Lent. Here is the definition of Lent from the General Norms for the Liturgical Year and the Calendar:
Lent runs from Ash Wednesday until the Mass of the Lord’s Supper exclusive [no. 28].
There’s nothing in that about Sundays not counting, so Sundays are indeed part of Lent.