Computation of time Months are computed according to the calendar from the date of publication. A "canonical month" (in contradistinction to a "calendar month") is a period of 30 days, while a "calendar month" is a continuous month. The vacatio legis is computed according to the calendar; for example, if a law is promulgated on 2 November, and the vacatio legis is 3 months, then the law takes effect on 2 February. So a universal law has a vacatio legis of approximately 90 days—3 months taken according to the calendar—while a particular law has a vacatio legis of approximately 30 days—1 month taken according to the calendar—unless specified to the contrary. References Notes Bibliography Abbo, John A., and Jerome D. Hannan, The Sacred Canons: A Concise Presentation of the Current Disciplinary Norms of the Church, Volume I (Canons 1-869 [1917 CIC]) (St. Louis, MO: B. Herder Book Co., 1952). Beal, John P., James A. Coriden, & Thomas J. Green. New Commentary on the Code of Canon Law. New York: Paulist Press, 2000. Code of Canons of the Eastern Churches, Latin-English Edition, New English Translation (Canon Law Society of America, 2001). 1983 Code of Canon Law. The IntraText Digital Library Canon L. Socy. Gr. Brit. & Ir., The Canon Law Letter and Spirit: A Practical Guide to the Code of Canon Law (Gerard Sheehy et al. eds., Liturgical Press 1995). Coriden, James A. An Introduction to Canon Law, revised edn. New York: Paulist Press, 2004. Coriden, James A., Thomas J. Green, Donald E. Heintschel, eds. The Code of Canon Law: A Text and Commentary. New York: Paulist Press, 1985. Commissioned by the Canon Law Society of America. De Agar, Joseph T. Martin. A Handbook on Canon Law, 2nd edn. Midwest Theological Forum, 2007. Della Rocca, Fernando. Manual of Canon Law (Milwaukee: The Bruce Publishing Company, 1959). Translated by the Rev. Anselm Thatcher, O.S.B. De Meester, A. Juris Canonici et Juris Canonico-Civilis Compendium: Nova Editio, Ad Normam Codicis Juris Canonici—Tomus Primus (Brugis: Societatis Sancti Augustini, 1921). Häring, Bernard, C.SS.R. The Law of Christ, Volume I: General Moral Theology. Trans. by Edwin G. Kaiser, C.PP.S. Westminster, Maryland: The Newman Press, 1961. Huels, John M. The Pastoral Companion: A Canon Law Handbook for Catholic Ministry, 5th edn. Midwest Theological Forum, 2016. Metz, René. What is Canon Law? (New York: Hawthorn Books, 1960). Translated from the French by Michael Derrick. Spiteri, Msgr. Laurence J. Canon