The Catholic Calendar, as used by the Catholic church and some other Christian faiths, is equal to the Gregorian calendar since its inception in 1582 and equal to the Julian calendar before that and from ca. the AD epoch. For dating events in the Old Testament, the contemporary Jewish calendar would be appropriate which is one of the Hebrew, Babylonian and Egyptian calendars. The calendar also includes the liturgical calendar, the Roman Rite, which has been reformed several times by the popes.
January
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
Octave of Nativity of the Lord
02
03
04
Telesphorus
Epiphany of the Lord
07
02
08
09
10
Hyginus
12
Baptism of our Lord
Hilary; Felix
03
Paul; Maurus
Marcellus I
Anthony
Prisca
Marius, Martha, Audifax, Abachum; Canute
Fabian, Sebastian
Agnes
04
Vincent, Anastasius
Raymund of Peñafort; Emerentiana
Timothy
Conversion of Paul; Peter
Polycarp
John Chrysostom
Peter Nolasco; Agnes
05
Francis de Sales
Martina
John Bosco
February
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
Ignatius
Purification of the Blessed Mary
Blase
Andrew Corsini
Agatha
Titus, Dorothy
Romuald
02
John of Matha
Cyril of Alexandria; Apollonia
Scholastica
Apparition of the Blessed Mary Immaculate
The Seven Holy Founders of the Order of Servants of the Blessed Marys
13
Valentine, Comm.
03
Faustinus, Jovitas
16
17
Simeon
19
20
21
04
Chair of Peter; Paul
Peter Damian
Matthias Apostle
25
26
Gabriel of Our Lady of Sorrows
28
05
29
In leap year the month of February is of 29 days, and the feast of Matthias is celebrated 25th day and the feast of Gabriel of Our Lady of Sorrows 28th day of February, and twice is said Sexto Kalendas, that is 24th and 25th; and the dominical letter, which was taken up in the month of January, is changed to the preceding; that, if in January, the dominical letter was A, it is changed to the preceding, which is g, etc.; and the letter f is kept twice, 24th and 25th.
March
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
01
02
03
Casimir Lucius I
05
Perpetua, Felicitys
Thomas Aquinas
02
John of God
Frances of Rome
The Forty Holys
11
Gregory I
13
14
03
15
16
Patrick
Cyril of Jerusalem
Joseph
20
Benedict
04
22
23
Gabriel the Archangel
Annunciation of the Blessed Mary
26
John Damascene
John Capistran
05
29
30
31
Friday after the I Sunday in Passiontide: the Seven Sorrows of the Blessed Mary, Comm.
April
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
01
Francis of Paula
03
Isidore
Vincent Ferrer
06
07
02
08
09
10
Leo I
12
Hermenegild
Justin; Tiburtius, Valerian, Maximus
03
15
16
Anicetus
18
19
20
Anselm
04
Soter, Cajus
George
Fidelis of Sigmaringen
Greater Litany – Mark
Cletus, Marcellinus
Peter Canisius
Paul of the Cross
05
Peter
Catherine of Siena
May
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
Joseph the Workman
Athanasius
Alexander, Eventius, Theodulus, Juvenal
Monica
Pius V
06
Stanislaus
02
08
Gregory Nazianzen
Antoninus; Gordian, Epimachus
Philip, James
Nereus, Achilleus, Domitilla, Pancras
Robert Bellarmine
Boniface
03
John Baptist de la Salle
Ubald
Paschal Baylon
Venantius
Peter, Celestine, Pudentiana
Bernardine of Siena
21
04
22
23
24
Gregory VII, Urban I.
Philip Neri Eleutherius
Bede the Venerable John I.
Augustine
05
Mary Magdalen de Pazzi
Felix I
Blessed Mary, Petronilla.
June
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
Angela Merici
Marcellinus, Peter, Erasmus
03
Francis Caracciolo
Boniface
Norbert
07
02
08
Primus, Felicians
Margaret
Barnabas
John of San Facundo; Basilides, Cyrinus, Nabor, Nazarius
Anthony of Padua
Basil the Great
03
Vitus, Modestus, Crescentias
16
Gregory Barbarigo
Ephraem Syrus; Mark, Marcellianus
Juliana Falconieri; Gervase, Protases
Silverius
Aloysius Gonzaga
04
Paulinus
Vigil
Nativity of John the Baptist
William
John, Paul
27
Vigil
05
Peter, Paul
Paul, Peter
July
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
The Most Precious Blood of our Lord Jesus Christ
Visitation of the Blessed Mary; Processus, Martinian
Irenaeus
04
Anthony, Mary, Zaccaria
06
Cyril, Methodius
02
Elizabeth
09
The Seven Holy Brothers; Rufina, Secundass
Pius I
John Gualbert; Nabor, Felix
13
Bonaventure
03
Henry II
Blessed Mary of Mt. Carmel
Alexius
Camillus de Lellis; Symphorosa and her seven Sons
Vincent de Paul
Jerome, Emiliani, Margaret
Lawrence of Brindisi, Praxedes
04
Mary Magdalene Penitent
Apollinaris Liborius
Christina
James, Christopher
Anne Mother of the Blessed Mary
Pantaleon
Nazarius, Celsus; Victor I; Innocent I
05
Martha; Felix, Simplicius, Faustinus, Beatrice
Abdon, Sennen
Ignatius
August
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
Holy Machabeess
Alphonsus Mary of Liguori; Stephen I.
03
Dominic
Dedication of Our Lady of the Snows
Transfiguration of our Lord Jesus Christ; Xystus II, Felicissimus, Agapitus
Cajetan Donatus
02
John Mary Vianney; Cyriacus, Largus, Smaragdus
Vigil Romanus
Laurence
Tiburtius, Susanna
Clare
Hippolytus, Cassians
Vigil; Eusebius
03
Assumption of the Blessed Mary
Joachim Father of the Blessed Mary
Hyacinth of Poland
Agapitus
John Eudes
Bernard
Jane Frances de Chantal
04
Immaculate Heart of the Blessed Mary; Timothy and companions
Philip Benizi
Bartholomew
Louis
Zephyrinus
Joseph Calasanctius
Augustine; Hermes
05
Beheading of John the Baptist; Sabina
Rose of Lima; Felix, Adauctus
Raymond Nonnatus
September
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
Giles; Holy Twelve Brothers
Stephen
Pius X
04
Laurence Justinian
06
07
02
Nativity of the Blessed Mary; Hadrian.
Gorgonius
Nicholas of Tolentino
Protus, Hyacinths
The Most Holy Name of Mary
13
Exaltation of the Holy Cross
03
Seven Sorrows of the Blessed Mary; Nicomedes
Cornelius, Cyprian; Euphemia, Lucy, Geminianus
Impression of the sacred Stigmata of Francis
Joseph of Cupertino
Januarius and companions
Eustace and companions
Matthew
04
Thomas of Villanova; Maurice and companions
Linus, Thecla
Our Lady of Ransom
25
Cyprian, Justina
Cosmas, Damian
Wenceslaus
05
Dedication of Michael Archangel
Jerome
October
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
Remigius
Holy Guardian Angels
Teresa of the Child Jesus
Francis of Assisi
Placid and companions
Bruno
Blessed Mary of the Rosary; Mark
02
Bridget; Sergius, Bacchus, Marcellus, Apuleius
John Leonard; Denis, Rusticus, Eleutherius
Francis Borgia
Maternity of the Blessed Mary
12
Edward
Callistus I
03
Teresa
Hedwig
Margaret Mary Alacoque
Luke
Peter of Alcantara
John Cantius
Hilarion; Ursula and companions
04
22
Anthony, Mary Claret
Raphael
Chrysanthus, Darias
Evaristus
27
Simon, Jude
05
29
30
31
Last Sunday in October: Our Lord Jesus Christ the King
November
Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
01
All Saints
All the Faithful Departed
03
Charles; Vitalis, Agricola
05
06
07
02
Holy Four Crowned
Dedication of the Archbasilica of the most Holy Saviour; Theodore
Andrew Avellino; Tryphon, Respicius, Nymphas
Martin Mennas
Martin I
Didacus
Josaphat
03
Albert the Great
Gertrude
Gregory Thaumaturgus
Dedication of the Basilicas of Saints Peter and Paul