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You are at the section Calendar History

Calendar Varieties-Gregorian

Calendars Based on the Gregorian Calendar Format-Jesus Christ Era

The Gregorian (or Gregorian-Christian Calendar)-Jesus Christ Era

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: Christian (1 A.D.) though scholars state Jesus Christ was born between 4 B.C. and 6 B.C.
  4. Number Change Day: January 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero

Calendars Based on the Gregorian Calendar Format-Other Eras

The Gregorian-RomeVer2 Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: Year of the Founding City of Rome (753 B.C.)
  4. Number Change Day: January 1
  5. Days of the month formats:
    1. counting up from 1 until the end of the month is reached.
    2. split into three zones (Nones, Ides and Kalends) in a countdown format.
  6. No Year Zero

The Gregorian-JulianPeriod Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: day zero beginning at noon on January 1, 4713 B.C. (for this modified calendar, the new day starts at 12:00 A.M.)
  4. Number Change Day: January 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. There is a Year Zero

The Gregorian-Hebrew Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the reckoning year of 3761 B.C. where they reckon that the world was created according to the Hebrew calendar. The epochic date, 1 Tishrei year 1, is equivalent to Monday, October 7, 3761 B.C.E. proleptic Julian-1 calendar or September 7, 3761 B.C.E. in the proleptic Gregorian calendar.
  4. Number Change Day: January 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero

The Gregorian-Rumi Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the reckoning year of 622 A.D. (July 15), when Mohammed and his followers migrated from Mecca to Medina
  4. Number Change Day: January 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero

The Gregorian-Rumi-MarchEquinox Calendar (also called Solar Hijri)

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the reckoning year of 622 A.D. (July 15), when Mohammed and his followers migrated from Mecca to Medina
  4. Number Change Day: usually March 21 but may be March 20 depending on year.
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero

The Gregorian-Byzantine Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the World Era beginning on September 1, 5509 B.C.
  4. Number Change Day: January 1, with the years from this calendar lining up on the dates with the Gregorian-Byzantine-9-1 (or Byzantine) calendar from September 1 through December 31 (number change eight months ahead)
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero

The Gregorian-Byzantine-9-1 Calendar (could be called Byzantine Modern for short)

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the World Era beginning on September 1, 5509 B.C.
  4. Number Change Day: September 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero

The Gregorian-Alexandrian Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the start of the year March 25, 5493 B.C.
  4. Number Change Day: January 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero

The Gregorian-Chronicon Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the start of the year March 21, 5507 B.C.
  4. Number Change Day: January 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero

The Gregorian-Dangi Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the the reckoning year of 2333 B.C. (regarded as year Dangi 1) of the year of the founding of Gojoseon, which was the date of the legendary founding of Korea by Dangun
  4. Number Change Day: January 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero
  7. Primary Usage Range: used by South Korea from 1945 until 1961.

The Gregorian-Juche Calendar

  1. Calendar format: Gregorian (proleptic before Oct 15, 1582 Gregorian)
  2. Intercalary format: leap day every four years in A.D. and every multiple of four with one subtracted (ex: 1, 5, 9, 13, etc.) from 1 B.C. and backwards. For years that are in multiples of 100 in A.D., only those that are divisible by 400 are leap years. For years that are in multiples of 100 with one subtacted in B.C. (ex: 101, 201, 301, 401, 501, etc.), only those that are divisible by 400 when you add one year to the dividend (ex: 401 B.C. plus one year is 400 B.C.), are leap years.
  3. era: based on the birth of North Korea Kim II-sung, beginning with year 1 (actually Juche 1) in the reckoning Gregorian year of 1912, which maps to the Dangun year of 4245.
  4. Number Change Day: January 1
  5. Days of the month format: counting up from 1 until the end of the month is reached.
  6. No Year Zero
  7. It was adopted on July 8, 1997 on the third anniversary of the death of Kim II-sung and was implemented the following September 9.
  8. Year rules: there are no "before Juche 1" years, and years 1911 and earlier are reckoned from the Gregorian calendar only. For the years after 1912, the years are given either in Juche years only, or in Juche years with the corresponding Gregorian calendar year, but not just the Gregorian calendar year alone.
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Calendar History Main Page Calendar 1: The Romulus Calendar I Calendar 2: The Republican Calendar I Calendar 3: The Republican Calendar II Calendar 4: The Republican Transitional Calendar Calendar 5: The Julian-Roman-Actual-1 Calendar Calendar 6: The Julian-Roman-Transitional-1 Calendar Calendar 7: The Julian-Roman-1 Calendar Calendar 8: The Julian-Kalends-1 Calendar Calendar 9: The Julian-1 Calendar Calendar 10: The Gregorian Calendar Dual Dating Date Confusion Definition of Days on the Calendars Definition of Calendars: Others Old, New and Unknown Styles Leap Year Error on the Julian-Roman-Actual-1 Calendar What Calendars Each Country Was Using Gregorian-Julian Differences By Century New Years Days Addenda Day and Year Measurements Calendar Varieties-Gregorian Calendar Varieties-Julian Calendar Varieties-Other Years Converted From Julian Period Day Lining Up Julian Dates Between Earth and Mars The Martian Calendar of Earth Converting From the Julian Period Date Creating a Julian Period Day Database File Truncating Answers Conversion Between Julian-1 and Gregorian Calendars Create a Calendar Leap Year Day Comparisons Swedish Calendar 1700-1712
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