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The International Liturgical Calendar or International Rite is a proposed unified and perpetual liturgical calendar for Christian faiths (Orthodox, Catholic, Protestant) that is compatible with ISO 8601 by being based upon the International Calendar, i.e. the Gregorian months and an accompanying week calendar.

Draft: Work in progress[]

International liturgical year
Tide Week Mon Tue Wed Thu Fri Sat Sun Month
Theophany
01 Circumcision Most Holy Name Epiphany Baptism Tevet
02
03
04 Conversion
Candlemas Presentation Septua­gesima Shevat
Shrove
06 -62 -61 -60 -59 -58 -57 Sexa­gesima
07 -55; Tu Bishvat -54 -53 -52 -51 -50 Quinqua­gesima / Estomihi
Carnival Rose Fast Ash -45 Chair of Peter -43 Matthias
Lent
Ember 2 -41 -40 -39 -38 -37 -36 -35 Adar
10 -34 -33 -32 -31 -30 -29 -28; Purim
11 -27 -26 -25 -24 -23 -22 Laetare
12 -20 Annunciation -18 -17 -16 Husband Joseph Judica
Passion -13 -12 -11 -10 Seven Sorrows -08 Palm Nisan
Holy -06 -05 Holy Maundy Good Holy Easter
Pascha; Omer
Bright; Pesach Easter +02 +03 +04 +05 +06 Divine Mercy; Sefirah
16 +08 +09 +10 +11 +12 +13 +14
17 +15 +16 +17 +18 +19 Evangelist Mark Jubilate Iyar
18 Worker Joseph +23 +24 +25 +26 +27 Apostles Philip & James
19 +29 +30 +31 +32 +33 +34 Vocem
Rogation +36 +37 +38 Ascension +40; Lag Ba'Omer +41 Exaudi
21 +43 +44 +45 +46 +47 +48 Whitsun Sivan
TBA
Ember 3 Pentecost +51 +52 +53 +54 Visitation Trinity; Shavuot
23 +57 +58 +59 Body and Blood +61 +62 +63
24 +64 +65 +66 +67 Sacred Heart Immaculate Heart +70
Kingdom
25 Baptist John Tammuz
26 Apostles Peter & Paul
27
28
29 Mary Magdalene TBA
30 Grandparents Joachim & Anne Apostle James
31 Transfiguration
32
33 Assumption Av
34 Tisha Queenship Apostle Bartholomew
35 (Ember)
36 Mary
~Ember 4 Holy Cross 7 Sorrows Elul
38 Evangelist Matthew
Michaelmas Archangels Guardian Angels
40
41 Rosh Hashanah Tishrei
42 Yom Kippur Evangelist Luke
Sukkot Apostles Simon & Jude
44 All Saints; Shemini Atzeret All Souls
45 Dedication of Basilicas King of the Universe Cheshvan
Advent
46 Presentation
47 Apostle Andrew
48 (Ember) Advent 1
49 Immaculate Conception Advent 2 Kislev
50 Advent 3
Ember 1 Advent 4
Christmas
Christmas; Hannukah Nativity Martyr Stephen Evangelist John Holy Innocents Holy Family
53 → 05b Septuagesima Ziv

The eventual 53rd week is liturgically postponed to the next year and gets inserted as week 05b. It includes Septuagesima Sunday but no other holidays.

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