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AMICO Editorial Committee

Proposal for Indexing Dates

Feburary 18, 1999


AMICO Date Indexing        
         
Creation Date Text Indexing Rule Start Date End Date Qualifier
OCT   OCS OCE OCQ
         
Direct translation of entered values        
Feb.10, 1874; 2/10/1874   18740210 18740210  
AD; A.D.; CE; C.E.       A.D.
BC; B.C.; B.C.E; BCE;       B.C.
YYYY-XXXX or YYYY/XXXX or YYYY to XXXX   YYYY XXXX  
1st century; first century; 1st c.; first cent.;   00010101 00991231 A.D.
12th Century BC, or -12th Century   -1199 -1100 B.C.
c.; c,; ca.; circa; ?; approx.;       circa
         
Interpreting circa        
c.1800 (e.g., c. a century, c.any YY00) +/- 20 years 17800101 18201231  
c.1810 (e.g. c. a decade; c.any YYY0) +/- 10 years 18000101 18201231  
c.1813 (e.g., c. a non-zero ending, year) +/- 2 years 18110101 18151231  
         
Interpreting partial century expressions        
first half of the years 0-49      
second half of the years 50-99      
early; first third of the years 0-33      
mid; second third of the years 34-66      
late; last third of the years 67-99      
         
Interpreting 'after' and 'before'        
after YY00 (e.g.;after 1800) +20 years 1800 1820  
before YY00 (e.g. Before 1800) -20 years 1870 1800  
after YYY0 (e.g. After 1810) +10 years 1810 1820  
before YYY0 (e.g. Before 1810) -10 years 1800 1810  
after YYYY (e.g. After 1813) +2 years 1813 1815  
before YYYY (eg. Before 1813) -2 years 1811 1813  
         
Dates indexed, but considered ambiguous - WARNINGS message returned        
YYYY and XXXX only first date YYYY YYYY  
YYYY or XXXX only first date YYYY YYYY  
YY first century 00YY 00YY  
YYY first millenium 0YYY 0YYY  
         
Dates not indexed - ERROR message returned        
YYYY-XXXX when XXXX is before YYYY        
YYYYMMDD when MM or DD are not possible        


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