Common Year: Difference between revisions

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The Common Year Reckoning is an [[Oeridian]], specifically an [[Aerdi]], creation, and replaced the Oeridian Record. The Common Year was established as the system of reckoning by Grand Prince [[Nasran I]] of the [[Great Kingdom of Aerdy]] in 645 OR (1 CY), when he declared universal peace throughout his the land, and took the title of [[Overking]].
The Common Year Reckoning is an [[Oeridian]], specifically an [[Aerdi]], creation, and replaced the Oeridian Record. The Common Year was established as the system of reckoning by Grand Prince [[Nasran I]] of the [[Great Kingdom of Aerdy]] in 645 OR (1 CY), when he declared universal peace throughout his the land, and took the title of [[Overking]].


==Equivalents==
==Conversions==
 
{| class="wikitable"
! style="text-align:left" |          !!  To CY !!  To OR !!  To OL !!  To TC !!  To FT !!  To BH !!  To OC !!  To SD
|- style="text-align: right"
! style="text-align:left" |  From CY   
|            —||  +644 ||  +804 ||  +1407 ||  +2150 ||  +2659 ||  +4462 ||  +5515
|- style="text-align: right"
! style="text-align:left" |  From OR   
|              -644 || —||  +160 ||  +763 ||  +1506 ||  +2015 ||  +3818 ||  +4871
|- style="text-align: right"
! style="text-align:left" |  From OL   
|              -804 ||  -160 || —||  +603 ||  +1346 ||  +1855 ||  +3658 ||  +4711
|- style="text-align: right"
! style="text-align:left" |  From TC   
|              -1407 ||  -763 ||  -603 || —||  +743 ||  +1252 ||  +3055 ||  +4108
|- style="text-align: right"
! style="text-align:left" |  From FT   
|              -2150 ||  -1506 ||  -1346 ||  -743 || —||  +509 ||  +2312 ||  +3365
|- style="text-align: right"
! style="text-align:left" |  From BH   
|              -2659 ||  -2015 ||  -1855 ||  -1252 ||  -509 || —||  +1803 ||  +2856
|- style="text-align: right"
! style="text-align:left" |  From OC   
|              -4462 ||  -3818 ||  -3658 ||  -3055 ||  -2312 ||  -1803 || —||  +1053
|- style="text-align: right"
! style="text-align:left" |  From SD   
|              -5515 ||  -4871 ||  -4711 ||  -4108 ||  -3365 ||  -2856 ||  -1053 ||    —
|- style="text-align: right"
|}
 
'''Note:''' None of the calendars of Oerth use a year zero, which complicates date conversion involving negative years since standard mathematics assumes a zero. This occasionally confuses even formal historians. The solution is to '''add 1''' when converting from a negative date to a positive, and to '''subtract 1''' when converting a positive date to a negative. If both dates are negative, no adjustment is necessary.
 
==Examples==
===1 CY===
===1 CY===
*Baklunish Hegira: 2660 BH (''[[World of Greyhawk Fantasy Game Setting|Folio]]''.5)
*Baklunish Hegira: 2660 BH (''[[World of Greyhawk Fantasy Game Setting|Folio]]''.5)
Line 35: Line 68:
*Suloise Dating: 6106 SD (''[[Living Greyhawk Gazetteer|LGG]]''.13)
*Suloise Dating: 6106 SD (''[[Living Greyhawk Gazetteer|LGG]]''.13)
*Touv Calendar: 1998 TC  
*Touv Calendar: 1998 TC  
==Conversions==
For results of 0 or less, subtract 1 from the result. In rare cases where the initial date is negative, convert to an older reckoning first. If this is not possible (such as with a negative SD date), then subtract 2 from the result (''ie'', once for each lack of a zero year).
===Baklunish Hegira===
BH date - 2659 = CY date.
: ''3250 BH - 2659 = [[591 CY]]''
: ''2238 BH - 2659 = -421 - 1 = -[[422 CY]]''
===Flan Tracking===
FT date - 2150 = CY date.
===Olven Calendar===
OC date - 4462 = CY date.
===Olman Lunar===
OL date - 804 = CY date.
===Oeridian Record===
OR date - 644 = CY date.
===Suloise Dating===
SD date - 5515 = CY date.
: ''6106 SD - 5515 = 591 CY
: ''5094 SD - 5515 = -421 - 1 = -422 CY''
: ''-500 SD - 5515 = -6015 - 2 = -6017 CY''
===Touv Calendar===
TC date - 1407 = CY date.
===Date determination within the Common Year reckoning===
To determine the date for a specific number of years spanning both BCY (Before Common Year) and CY, it is essential to account for the lack of a zero year. This is done in a similar manner to converting dates from another reckoning.
*For ''x'' years '''before''' a CY date, '''subtract''' 1 if the result is 0 or lower.
: ''591 CY - 591 = 0 - 1 = -1 CY
: ''591 CY - 600 = -9 - 1 = -10 CY
*For ''x'' years '''after''' a BCY (Before Common Year) date, '''add''' 1 if the result is 0 or higher.
: ''-422 CY + 422 = 0 + 1 = 1 CY''
: ''-422 CY + 500 = 78 + 1 = 79 CY''


==See also==
==See also==

Revision as of 22:34, 12 February 2019

In the World of Greyhawk, the Common Year, or CY, is the basis of the common calendar. Years occurring before the Common Year are denoted with negative numbers, or are sometimes listed as "BCY" (Before Common Year).

There is no Common Year zero (0 CY), as the reckoning began with the first year, 1 CY, which must be accounted for when converting other systems of reckoning years prior to 1 CY, such as the Baklunish Hegira (BH), Flan Tracking (FT), Oeridian Record (OR, also known as the Oerid Reckoning), the Olman Lunar (OL), the Olven Calendar (OC), Suloise Dating (SD), or the Touv Calendar (TC).

Days, weeks, and months within the Common Year are reckoned using the Greyhawk Calendar.

History

The Common Year Reckoning is an Oeridian, specifically an Aerdi, creation, and replaced the Oeridian Record. The Common Year was established as the system of reckoning by Grand Prince Nasran I of the Great Kingdom of Aerdy in 645 OR (1 CY), when he declared universal peace throughout his the land, and took the title of Overking.

Conversions

To CY To OR To OL To TC To FT To BH To OC To SD
From CY — +644 +804 +1407 +2150 +2659 +4462 +5515
From OR -644 — +160 +763 +1506 +2015 +3818 +4871
From OL -804 -160 — +603 +1346 +1855 +3658 +4711
From TC -1407 -763 -603 — +743 +1252 +3055 +4108
From FT -2150 -1506 -1346 -743 — +509 +2312 +3365
From BH -2659 -2015 -1855 -1252 -509 — +1803 +2856
From OC -4462 -3818 -3658 -3055 -2312 -1803 — +1053
From SD -5515 -4871 -4711 -4108 -3365 -2856 -1053 —

Note: None of the calendars of Oerth use a year zero, which complicates date conversion involving negative years since standard mathematics assumes a zero. This occasionally confuses even formal historians. The solution is to add 1 when converting from a negative date to a positive, and to subtract 1 when converting a positive date to a negative. If both dates are negative, no adjustment is necessary.

Examples

1 CY

  • Baklunish Hegira: 2660 BH (Folio.5)
  • Flan Tracking: 2151 FT (Folio.5)
  • Olven Calendar: 4463 OC (Folio.5)
  • Olman Lunar: 805 OL (tSB.64)
  • Oeridian Record: 645 OR (Folio.5)
  • Suloise Dating: 5116 SD (Folio.5)
  • Touv Calendar: 1408 TC (tSB.64)

576 CY

  • Baklunish Hegira: 3235 BH (Folio.5)
  • Flan Tracking: 2726 FT (Folio.5)
  • Olven Calendar: 5038 OC (Folio.5)
  • Olman Lunar: 1380 OL
  • Oeridian Record: 1220 OR (Folio.5)
  • Suloise Dating: 6091 SD (Folio.5)
  • Touv Calendar: 1983 TC

591 CY

  • Baklunish Hegira: 3250 BH (LGG.13)
  • Flan Tracking: 2741 FT (LGG.13)
  • Olven Calendar: 5053 OC (LGG.13)
  • Olman Lunar: 1395 OL (tSB.64)
  • Oeridian Record: 1235 OR (LGG.13)
  • Suloise Dating: 6106 SD (LGG.13)
  • Touv Calendar: 1998 TC

See also

Bibliography

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