Below are documented the various religious holidays in the year 2012 for many of the key world religions.  The winter solstice is on December 21, 2012 — the same day as the Mayan Calendar ends.

JANUARY 2012

• 1
  • Mary, Mother of God - Catholic Christian
  • Feast of St Basil - Orthodox Christian
  • Gantan-sai (New Years) - Shinto
• 5
  • Twelfth Night - Christian
• 6
  • Epiphany - Christian
  • Feast of the Theophany - Orthodox Christian
• 14
  • Maghi - Sikh
• 15
  • World Religion Day - Baha’i

FEBRUARY 2012

• 5
  • Mawlid an Nabi * - Islam
• 8
  • Tu BiShvat * - Judaism
• 22
  • Ash Wednesday - Christian
• 25 - March 1
  • Intercalary Days * - Baha’i

MARCH 2012

• 8
  • Purim * - Judaism
• 17
  • St Patrick’s Day - Christian
• 20 Vernal Equinox
  • Ostara * - Wicca northern hemisphere
  • Mabon * - Wicca southern hemisphere
• 21
  • Naw Ruz (News Year) * - Baha’i
  • Norouz (New Year) - Persian/Zoroastrian
• 26
  • Khordad Sal (Birth of Prophet Zaranhushtra) Zoroastrian

APRIL 2012

• 7-8  
  • Pesach (Passover)  First two days * - Judaism
• 8
  • Easter - Christian
• 13-14
  • Pesach (last two days) * - Jewish
• 15
  • Easter/Pascha - Orthodox Christian
• 19
  • Yom HaShoah * - Judaism
• 21
  • First Day of Ridvan * - Baha’i
• 27
  • Yom Ha’Atzmaut * - Jewish
• 29
  • Ninth Day of Ridvan * - Baha’i

MAY 2012

• 2
  • Twelfth Day of Ridvan * - Baha’i
• 17
  • Ascension Day - Christian
• 10
  • Lag B’Omer * - Jewish
• 23
  • Declaration of the Bab * - Baha’i
• 27
  • Pentecost - Christian
• 27-28
  • Shavuot * - Jewish
• 29
  • Ascension of Baha’u'llah * - Baha’i

JUNE 2012

• 17
  • Lailat al Miraj * - Islam
• 20 Summer Solstice
  • Litha * - Wicca northern hemisphere
  • Yule * - Wicca southern hemisphere

JULY 2012

• 9
  • Martyrdom of the Bab * - Baha’i
• 20
  • Ramadan Begins * - Islam
• 29
  • Tisha B’Av * - Judaism

AUGUST 2012

• 19
  • Id al Fitr * - Islam

SEPTEMBER 2012

• 17-18
  • Rosh HaShanah * - Judaism
• 22 Autumnal Equinox
  • Mabon * - Wicca northern hemisphere
  • Ostata * - Wicca southern hemisphere
• 26
  • Yom Kippur * - Judaism
• 29
  • Tish’a Bav * - Jewish

OCTOBER 2012

• 1-7 (1-2 Primary Obligation Days)
  • Sukkot * - Judaism
• 8
  • Shemini Atzeret * - Judaism
• 9
  • Simhat Torah *- Judaism
• 20
  • Birth of the Bab * - Baha’i
• 28
  • Milvian Bridge Day - Christian

NOVEMBER 2012

• 12
  • Birth of Baha’u'llah * - Bahai
• 15
  • Muharram -  New Year * - Islam
• 22
  • Thanksgiving - Interfaith
• 24
  • Ashura * - Islam
• 26
  • Day of the Covenant * - Baha’i
• 28
  • Ascension of Abdu’l-Baha * - Baha’i

DECEMBER 2012

• 2
  • Advent - First Sunday - Christian
• 9-16
  • Hanukkah * - Judaism
• 21 Winter Solstice
  • Yule * - Wicca northern hemisphere
  • Litha * - Wicca southern hemisphere
  • Yule - Christian
• 25
  • Christmas * - Christian
• 26
  • Zarathosht Diso (Death of Prophet Zarathushtra Zoroastrian
• 28
  • Holy Innocents - Christian
• 31
  • Watch Night - Christian