Every year, the Catholic Church all over the world celebrate her seasons, solemnities and feasts by following the Liturgical Calendar. The Liturgical Calendar is a cycle of three years wherein the Church base the dates of the season and feasts depending upon the cycle in which that year is assigned. In the Liturgical Calendar, Seasons and some solemnities are movable which means the dates would vary depending on the year. For example the Solemnities and Feasts that are celebrated on Sundays like Palm Sunday, Easter, Pentecost etc have different dates every year depending on the cycle. There are also Feasts and Solemnities that are immovable and are designated on a particular date regardless of Liturgical year like for example Christmas Day (Dec. 25), Immaculate Conception (Dec 8 ) and Solemnity of Mary, Mother Of God (Jan. 1).
The Liturgical Calendar differs from the Roman Calendar in a sense that the Liturgical Year that we observe begins with the season and not on first month of the year. In the Roman Calendar, the current year begins on January 1st. But on the Liturgical Calendar, tte Catholic Church’s year begins on the First Sunday of Advent and ends on the Solemnity of Christ the King. The Church is following the Liturgical Calendar in observance of the Conception (Advent), Birth (Christmas), Life (Ordinary time), Passion (Lent) Death (Triduum), Resurrection (Easter to Pentecost) and Reign (Christ the King) of our Lord.
The Liturgical year is used by the Catholic Church in terms of Celebration of the Liturgy, both in the Divine office and in the Eucharistic Celebration. Hence, wherever you are in the world, rest assured that the Catholic church, regardless of diocese is celebrating one and the same season and feasts — A universal oneness with all the Catholics in the world. Each Dioceses, Religious Orders and Countries have variations in the Liturgical Calendar in some feasts and solemnities.
The annual Lenten Season is a fitting time to climb the holy mountain of easter. The Lenten season has a double character, namely to prepare both catechumens and faithful to celebrate the paschal mystery. The Catechumens, with the rite of election and scrutinies and by catechesis, are prepared for the celebration of the Sacraments of Christian initiation; the faithful, ever more atentive to the word of God and prayer, prepare themselves by penance for the renewal of their baptiismal promises.
9 Wed Ash Wednesday violet
Jl 2:12-18/2 Cor 5:20-6:2/Mt 6:1-6, 16-18 Prop Pss
10 Thu Thursday after Ash Wednesday violet
Dt 30:15-20/Lk 9:22-25 Pss IV
11 Fri Friday after Ash Wednesday violet
Is 58:1-9a/Mt 9:14-15
12 Sat Saturday after Ash Wednesday violet
Is 58:9b-14/Lk 5:27-32
13 SUN FIRST SUNDAY OF LENT violet
Gn 2:7-9; 3:1-7/Rom 5:12-19 or 5:12, 17-19/Mt 4:1-11 Pss I
14 Mon Lenten Weekday violet
Lv 19:1-2, 11-18/Mt 25:31-46
15 Tue Lenten Weekday violet
Is 55:10-11/Mt 6:7-15
16 Wed Lenten Weekday violet
Jon 3:1-10/Lk 11:29-32
17 Thu Lenten Weekday violet
[Saint Patrick, bishop]
Est C:12, 14-16, 23-25/Mt 7:7-12
18 Fri Lenten Weekday violet
[Saint Cyril of Jerusalem, bishop and doctor of the Church]
Ez 18:21-28/Mt 5:20-26
19 Sat Saint Joseph, husband of the Blessed Virgin Mary white
solemnity
2 Sm 7:4-5a, 12-14a, 16/Rom 4:13, 16-18, 22/Mt 1:16, 18-21, 24a or Lk 2:41-51a Prop Pss
20 SUN SECOND SUNDAY OF LENT violet
Gn 12:1-4a/2 Tm 1:8b-10/Mt 17:1-9 Pss II
21 Mon Lenten Weekday violet
Dn 9:4b-10/Lk 6:36-38
22 Tue Lenten Weekday violet
Is 1:10, 16-20/Mt 23:1-12
23 Wed Lenten Weekday violet
[Saint Toribio de Mogrovejo, bishop]
Jer 18:18-20/Mt 20:17-28
24 Thu Lenten Weekday violet
Jer 17:5-10/Lk 16:19-31
25 Fri The Annunciation of the Lord white
solemnity
Is 7:10-14; 8:10/Heb 10:4-10/Lk 1:26-38 Prop Pss
26 Sat Lenten Weekday violet
Mi 7:14-15, 18-20/Lk 15:1-3, 11-32
27 SUN THIRD SUNDAY OF LENT violet
Ex 17:3-7/Rom 5:1-2, 5-8/Jn 4:5-42 or 4:5-15, 19b-26, 39a, 40-42 Pss III
28 Mon Lenten Weekday violet
2 Kgs 5:1-15b/Lk 4:24-30
29 Tue Lenten Weekday violet
Dn 3:25, 34-43/Mt 18:21-35
30 Wed Lenten Weekday violet
Dt 4:1, 5-9/Mt 5:17-19
31 Thu Lenten Weekday violet
Jer 7:23-28/Lk 11:14-23
1 Fri Lenten Weekday violet
Hos 14:2-10/Mk 12:28-34
2 Sat Lenten Weekday violet
[Saint Francis of Paola, hermit]
[Blessed Pedro Calungsod, Martyr]
Hos 6:1-6/Lk 18:9-14
3 SUN FOURTH SUNDAY OF LENT violet/rose
1 Sm 16:1b, 6-7, 10-13a/Eph 5:8-14/Jn 9:1-41 or 9:1, 6-9, 13-17, 34-38 (31) Pss IV
4 Mon Lenten Weekday violet
[Saint Isidore, bishop and doctor of the Church]
Is 65:17-21/Jn 4:43-54
5 Tue Lenten Weekday violet
[Saint Vincent Ferrer, priest]
Ez 47:1-9, 12/Jn 5:1-16
6 Wed Lenten Weekday violet
Is 49:8-15/Jn 5:17-30
7 Thu Lenten Weekday violet
[Saint John Baptist de la Salle, priest]
Ex 32:7-14/Jn 5:31-47
8 Fri Lenten Weekday violet
Wis 2:1a, 12-22/Jn 7:1-2, 10, 25-30
9 Sat Lenten Weekday violet
Jer 11:18-20/Jn 7:40-53
10 SUN FIFTH SUNDAY OF LENT violet
Ez 37:12-14/Rom 8:8-11/Jn 11:1-45 or 11:3-7, 17, 20-27, 33b-45 Pss I
11 Mon Lenten Weekday violet
[Saint Stanislaus, bishop and martyr]
Dn 13:1-9, 15-17, 19-30, 33-62 or 13:41c-62/Jn 8:1-11
12 Tue Lenten Weekday violet
Nm 21:4-9/Jn 8:21-30
13 Wed Lenten Weekday violet
[Saint Martin I, pope and martyr]
Dn 3:14-20, 91-92, 95/Jn 8:31-42
14 Thu Lenten Weekday violet
Gn 17:3-9/Jn 8:51-59
15 Fri Lenten Weekday violet
Jer 20:10-13/Jn 10:31-42
16 Sat Lenten Weekday violet
Ez 37:21-28/Jn 11:45-56
BEGINNING OF HOLY WEEK – In Holy Week the Church celebrates the mysteries of salvation accomplished by Christ in the last days of his earthly life, from his messianic eantry into Jerusalem, until his blessed Passion and Glorious Resurrection. Lent continues until Maundy Thursday. With evening Mass of the Lord’s Supper on Maundy Thursday begins the Easter Triduum, which includes Good Friday of the Lord’s Passion and Holy Saturday, centeres upon the Easter Vigil and concludes with vespers on Easter Sunday of the Lord’s Resurrection. The Weekdays of this week are dedicated to the celebration of penance, abstaining from celebration of the sacraments of baptism (except in emergency) and confirmation, since these have their natural place in the easter vigil.
17 SUN PALM SUNDAY OF THE LORD’S PASSION red
Mt 21:1-11 (37)/Is 50:4-7/Phil 2:6-11/Mt 26:14-27:66 or 27:11-54 Pss II
18 Mon Monday of Holy Week violet
Is 42:1-7/Jn 12:1-11
19 Tue Tuesday of Holy Week violet
Is 49:1-6/Jn 13:21-33, 36-38
20 Wed Wednesday of Holy Week violet
Is 50:4-9a/Mt 26:14-25
EASTER TRIDUUM – Christ redeemed us all and gave perfect glory to God principally through his paschal mystery: dying he destroyed our death and rising he restored our life. Therefore, the Easter Triduum of the passion, burial and resurrection of Christ is the Culmination of the entire liturgical year. Thus the solemnity of Easter has the same kind of preeminence in the liturgical year that Sunday has in the week. The Easter Triduum begins with the Evening Mass of the Lord’s supper, reaches its high point in the Easter Vigil, and closes with the evening prayer on Easter Sunday.
21 Thu Maundy Thursday violet/Mass:white
Chrism Mass: Is 61:1-3a, 6a, 8b-9/Rv 1:5-8/Lk 4:16-21
Evening Mass of the Lord’s Supper: Ex 12:1-8, 11-14/1 Cor 11:23-26/Jn 13:1-15
22 Fri Good Friday of the Lord’s Passion red
Is 52:13-53:12/Heb 4:14-16; 5:7-9/Jn 18:1-19:42 Prop Pss
23 Sat Black Saturday violet/Vigil:white
Vigil: Gn 1:1-2:2 or 1:1, 26-31a/Gn 22:1-18 or 22:1-2, 9a, 10-13, 15-18/Ex 14:15-15:1/Is 54:5-14/Is 55:1-11/Bar 3:9-15, 32-4:4/Ez 36:16-17a, 18-28/Rom 6:3-11/Mt 28:1-10 Prop Pss
—END OF LENTEN SEASON

i only trust in jesus my king in this danger and sinfull world.
Thank you so much for all of the work to present the information in such a splendid fashion.
One small edit — February needs to be changed to March!
I can’t see where Lent is 40 days if Sundays are not included and lent ends on Holy Thursday. Looking at the calendar for March 2011 and disregarding Sundays I find 20 days. For April, again disregarding Sundays, and ending lent on April 20th I find 17 days for a total of 37. If I include Holy Thursday, Good Friday, and Holy Saturday I would calculate 40 but all the Catholic web sites say lent ends on Holy Thursday. What am I doint wrong?