Verga: The reference is to the liturgical calendar for reading of scriptures, Holy days of the church which are celebrated by both Protestant, Catholic, and Orthodox Christians.
It is NOT a reference to the names of individual days and months that are used in today’s English language and all the sources it received those names from, particularly from ancient Rome.
Since mind reading is against the rules, I can only go by what he wrote. If he meant liturgical he needs to be more clear in his posts.