The Gregorian Calendar is increasingly used for commerce
world-wide. It is based upon the earlier Julian Calendar which
was designed by Pagan priests in Rome circa 50 BCE. Julius
Caesar had asked them to design a calendar that was more accurate than the ones
which were in use at the time. During the Christian era, the calendar was
adjusted so that DEC-25 of the year 1 BCE was believed to be the birthday of
Jesus Christ. Today, most authorities believe that Jesus was born sometime
between 4 and 7 BCE, perhaps in the fall of the year.
Unfortunately, the Julian calendar was too long by about 11 minutes and 14
seconds each year, or one day every 128 years. By the late 16th century, this
error had accumulated to an intolerable 10 days. Pope Gregory XIII commissioned
a study to decide how to correct it and how to prevent it from drifting in the
future. The solution was to make most of the century years into non-leap years;
only those which were evenly divisible by 400 (e.g. 1600, 2000, 2400 etc.) were
to be leap years. Roman Catholic countries corrected the calendar by making
1582-OCT-15 CE follow OCT-4. In England, they made an 11
day correction; the day following 1752-SEP-2 was SEP-14. Greece did not convert
to the Gregorian calendar until 1923.
There remain many religiously based calendars which are different from the
Gregorian calendar. Some are:
Most Eastern Orthodox Churches continue to use the Julian calendar. It
is currently 13 days later than the Gregorian calendar. The gap continues to grow. They
currently celebrate Christmas on JAN-7 and New Year's Day on January 14.
Romanian and Greek Orthodox do not follow this tradition.
The Jewish calendar is based on their belief of the date that the
universe was created: 3761 BCE. The abbreviation called "AM"
for Anno Mundi is used. The Jewish calendar is moon-based. An additional
month is added every third or fourth year. Thus, their year is of 354 to 385
days in duration.
The Islamic calendar is based upon 622 CE, the year
of the Hegira, when the Prophet Muhammad traveled from Mecca to Medina. The abbreviation "H" or "AH"
is used after the date; it stands for "Hegira" or "Anno Hejira". It is
a lunar calendar that repeats itself every 30 years. Year 2, 5, 7, 10, 13, 16, 18, 21, 24,
26 and 29 are leap years and have 355 days. Common (non leap years) have 354 days. That is
11 days shorter than the solar year. About three times a century, Muslims can celebrate
two new years during one Gregorian year. Each lunar month begins with the
visible sighting of the crescent of the new moon. A month, and thus a
holy day, is often delayed a day from the time that astronomical
calculations would predict them.
The Hindu calendar is based upon the start of the Saka Era in 78 CE.
The date is often followed by the letters SE. The original
base date for the calendar was at a planetary alignment involving Jupiter in
3102 BCE.
The Sikh calendar is based on the start of the Khalsa Era three
centuries ago. Their year begins on Apr-13 or 14. The date is often followed by the
letters KE.
The Baha'i calendar began when the Bab declared that a new
Manifestation of God would shortly appear. The beginning of the Baha'i Era occurred in
1260 AH and 1844 CE. Their calendar has 19 months, each with 19 days, for a total of 361
days per year. The letters BE stand for "Baha'i Era."
The traditional Zoroastrian calendar is composed of 12 months, each
containing 30 days. The final month has 5 gatha days added. Initially, an
additional month of 30 days was added once every 120 years. The base year
for the calendar is the date of the coronation of the last Zoroastriaa
Sasanian King, Yazdegird II in 631 CE. 1368 Y overlaps 1999 CE. The Iranian
Zoroastrians stopped adding this additional month in 1009 CE; Their fellow
believers in India stopped in 1129 CE. New Year has been gradually moving
earlier (about 1 day every 4 years) from its original date in mid-March. It
now occurs in the Fall. Mr. Khurshedji Cama proposed a revised calendar in
1906 CE. It follows the Gregorian leap-year system and has New Year
permanently fixed on MAR-21. This calendar is used by Zoroastrians around
the world, except India. 8
The Creativity Movement
(formerly called the World Church of the Creator (W.C.O.T.C.) is a racist,
anti-communist, and homophobic religious group centered in Illinois.
They base their calendar on 1973 CE --the date that the first edition
of thieir book "Nature's Eternal Religion" was
published. This is regarded as the year in which the group was
founded. They have abandoned the Gregorian calendar. 1973 is
considered the Incepto de Creativitat (Inception of
Creativity), or I.C. Years following are called "Anno de
Creativitat." Thus, 1974 CE is called 1 A.C. The years before
I.C. are called Prius Creativitat (Before Creativity). One of their
main holidays is West Victory Day, held each DEC-29. It
commemorates the "white" victory
over the last organized native America resistance in 83 PC (1890 CE).
The Mayan calendar expresses
a date in a complex five number format. e.g. 6.19.18.1.5 means:
6 Baktun, an interval of 144,000 days (almost 400 years),
19 Katun (generations) of 7200 days (almost 20 years),
18 Tun (years) of 360 days,
1 Uinal (month) of 20 days,
5 Kin (days)
for a total of 1,007,305 days.
J.Eric Thompson determined that the first day of the Mayan calendar
(0.0.0.0.0) was on 3114-AUG-11 BCE. 9 They
believed that Venus was born on that day. Another source says AUG-13 of the
same year. Mayans also had a "Great Cycle of the Long Count"
of 13 Baktuns or 5,125.36 years. They anticipated the end
of the world at the Winter
Solstice, 2012-DEC-21 or 13.0.0.0.0 in their notation. 10
The first day of various religious years falls on:
Secular Calendar Date
Start of Religious Year
1996-SEP-14
5757 AM
1997-MAR-21 **
153 BE
1997-MAR-22
1919 SE
1997-APR-13 *
299 KE
1997-MAY-09
1418 H
1997-OCT-02
5758 AM
1998-MAR-21 **
154 BE
1998-MAR-22
1920 SE
1998-APR-13 *
300 KE
1998-APR-28
1419 H
1998-SEP-21
5759 AM
1999-MAR-21 **
155 BE
1999-MAR-22
1921 SE
1999-APR-13 *
301 KE
1999-APR-17
1420 H
1999-SEP-11
5760 AM
2000-MAR-21 **
156 BE
2000-MAR-22
1922 SE
2000-APR-06
1421 H
2000-APR-13 *
302 KE
2000-SEP-30
5761 AM
* Approximate dates.
** Except in the Middle East
JewishGen® provides a guide to Jewish genealogical research. One service is an online
calendar that converts Gregorian to Jewish dates and back. For example St. Patrick's day
on 1999-MAR-17 is also 5759 Adar(I) 29.1 Another web site,
Panda Systems, offers a free calendar conversion program for the MacOS which works among
Julian, Gregorian and Jewish calendar systems. 2
See FSN Calendar
for other calendars, including calendars related to: Bible prophecy,
Chinese, Catholic liturgical year, Judaism, Advent, Aztec, Islamic,
Interfaith, and Zoroastrian.