ADds a new property to Datetime defaults to define the BC dates appendix to be used. Before this patch the appendix was selected using the first element of the available appendixes. Now the output appendix can be easily configured without modifying the list of available appendix

See #73181

Author: novaxpro

src/elements/DateTime/DateTime.coffee

@@ -17,7 +17,8 @@ class CUI.DateTime extends CUI.Input
 
 	@defaults:
 		button_tooltip: "Open calendar"
-		bc_appendix: ["B.C.","BC","V. CHR.","VCHR","VCHR."]
+		bc_appendix: ["B.C.","BC","V. CHR.","VCHR","VCHR."] # BC appendixes to recognize
+		bc_appendix_output: "B.C." # BC appendix to output
 
 	initOpts: ->
 		super()
@@ -1478,11 +1479,11 @@ class CUI.DateTime extends CUI.Input
 	# BC appendix always adds one year. Therefore year 0 is 1 BC.
 	@formatMomentWithBc: (mom, format) ->
 		if mom.year() == 0
-			return "1 #{CUI.DateTime.defaults.bc_appendix[0]}"
+			return "1 #{CUI.DateTime.defaults.bc_appendix_output}"
 
 		if mom.bc
 			bc = parseInt(mom.bc) + 1
-			return "#{(bc)} #{CUI.DateTime.defaults.bc_appendix[0]}"
+			return "#{(bc)} #{CUI.DateTime.defaults.bc_appendix_output}"
 
 		if mom.year() > 0
 			v = mom.format(format)
@@ -1492,7 +1493,7 @@ class CUI.DateTime extends CUI.Input
 			return v.replace(regexp, ""+mom.year())
 
 		mom.subtract(1, "year")
-		v = mom.format(format) + " " + CUI.DateTime.defaults.bc_appendix[0]
+		v = mom.format(format) + " " + CUI.DateTime.defaults.bc_appendix_output
 		# remove the "-" and all possible zeros.
 		replace = "\\-0*#{-1 * mom.year()}";
 		regexp = new RegExp(replace);