Module:Complex date

    From Commons

    Documentation for this module may be created at Module:Complex date/doc

    --[[ 
      __  __           _       _         ____                      _                 _       _       
     |  \/  | ___   __| |_   _| | ___ _ / ___|___  _ __ ___  _ __ | | _____  __   __| | __ _| |_ ___ 
     | |\/| |/ _ \ / _` | | | | |/ _ (_) |   / _ \| '_ ` _ \| '_ \| |/ _ \ \/ /  / _` |/ _` | __/ _ \
     | |  | | (_) | (_| | |_| | |  __/_| |__| (_) | | | | | | |_) | |  __/>  <  | (_| | (_| | ||  __/
     |_|  |_|\___/ \__,_|\__,_|_|\___(_)\____\___/|_| |_| |_| .__/|_|\___/_/\_\  \__,_|\__,_|\__\___|
                                                            |_|                                      
     
    This module is intended for creation of complex date phrases in variety of languages.
     
    Once deployed, please do not modify this code without applying the changes first at Module:Complex date/sandbox and testing 
    at Module:Complex date/sandbox/testcases.
     
    Authors and maintainers:
    * User:Sn1per - first draft of the original version 
    * User:Jarekt - corrections and expansion of the original version 
     
    ]]
    
    -- List of external modules and functions
    local p = {Error = nil}
    local i18n       = require('Module:i18n/complex date')   -- used for translations of date related phrases
    local ISOdate    = require('Module:ISOdate')._ISOdate    -- used for parsing dates in YYYY-MM-DD and related formats
    local formatnum  = require('Module:Formatnum').formatNum -- used for translation into other alphabets
    local Calendar   = require('Module:Calendar')            -- used for conversions between Julian and Gregorian calendar dates
    
    -- ==================================================
    -- === Internal functions ===========================
    -- ==================================================
    
    local function langSwitch(list,lang)
    	local langList = mw.language.getFallbacksFor(lang)
    	table.insert(langList,1,lang)
    	table.insert(langList,math.max(#langList,2),'default')
    	for i,language in ipairs(langList) do
    		if list[language] then
    			return list[language]
    		end
    	end
    end
    
    -- ==================================================
    local function formatnum1(numStr, lang)
    -- mostly require('Module:Formatnum').formatNum function used to translate a number to use different numeral characters, 
    -- except that it it does not call  that function unless the language is on the list "LList"
    	local LList = {bn=1,bpy=1,kn=1,hi=1,mr=1,new=1,pa=1,gu=1,fa=1,glk=1,mzn=1,ur=1,ar=1,ckb=1,ks=1,lo=1,['or']=1,bo=1,['ml-old']=1,mn=1,te=1,th=1}
    	if LList[lang] then -- call only when the language is on the list
    		numStr = formatnum(numStr, lang, 1)
    	end
    	return numStr
    end
    
    -- ==================================================
    local function getISODate(datestr, datetype, lang, num, case)
    -- translate dates in the format YYYY, YYYY-MM, and YYYY-MM-DD
    	if  not case and i18n.Translations[datetype] then
    		-- look up the grammatical case needed and call ISOdate module
    		local rec = langSwitch(i18n.Translations[datetype], lang)
    		if type(rec)=='table' then
    			case = rec.case[num]
    		end
    	end
    	return ISOdate(datestr, lang, case, '', 1)
    end
    
    -- =======================================================================
    local function translatePhrase(date1, date2, operation, lang, state)
    -- use tables in Module:i18n/complex date to translate a phrase
    	if not i18n.Translations[operation] then
    		p.Error = string.format('<span style="background-color:red;">Error in [[Module:Complex date]]: input parameter "%s" is not recognized.</span>', operation or 'nil')
    		return ''
    	end
    	local dateStr = langSwitch(i18n.Translations[operation], lang)
    	if type(dateStr)=='table' then
    		dateStr = dateStr[1]
    	end
    	if type(dateStr)=='function' then
    		local dateFunc = dateStr
    		local nDates = i18n.Translations[operation]['nDates']
    		if nDates==2 then -- 2 date phrase
    			dateStr = dateFunc(date1, date2, state)
    		else  -- 1 date phrase
    			dateStr = dateFunc(date1, state)
    		end
    	end
    	
    	if type(dateStr)=='string' then
    		-- replace parts of the string '$date1' and '$date2' with date1 and date2 strings
    		dateStr = mw.ustring.gsub(dateStr, '$date1', date1)
    		dateStr = mw.ustring.gsub(dateStr, '$date2', date2)
    	else
    		-- Special case of more complex phrases that can be build out of simple phrases
    		-- If complex case is not translated to "lang" than build it out of simpler ones
    		local x = dateStr
    		dateStr = p._complex_date(x.conj, x.adj1, date1, x.units1, x.era1, x.adj2, date2, x.units2, x.era2, lang, 2)
    	end
    	return dateStr
    end
    
    -- =======================================================================
    local function oneDatePhrase(dateStr, adj, era, units, lang, num, case, state)
    -- translate a single date phrase
    	if num==2 then
    		state.adj, state.era, state.units, state.precision = state.adj2, state.era2, state.units2, state.precision2 
    	end
    	
    	-- dateStr can have many forms: ISO date, year or a number for 
    	-- decade, century or millennium
    	if units == '' then -- unit is "year", "month", "day"
    		dateStr = getISODate(dateStr, adj, lang, num, case)
    	else -- units is "decade", "century", "millennium''
    		dateStr = translatePhrase(dateStr, '', units, lang, state)
    	end
    	
    	-- add adjective ("early", "mid", etc.) or preposition ("before", "after", 
    	-- "circa", etc.) to the date
    	if adj ~= '' then
    		dateStr = translatePhrase(dateStr, '', adj, lang, state)
    	else -- only era?
    		dateStr = formatnum1(dateStr, lang)
    	end
    	
    	-- add era
    	if era ~= '' then
    		dateStr = translatePhrase(dateStr, '', era, lang, state)
    	end
    	return dateStr
    end
    
    -- =======================================================================
    local function twoDatePhrase(date1, date2, state, lang)
    -- translate a double date phrase
    	local dateStr, case
    	local era=''
    	if state.era1 == state.era2 then
    		-- if both eras are the same than add it only once
    		era = state.era1
    		state.era1 = ''
    		state.era2 = ''
    	end
    	case = {nil, nil}
    	if i18n.Translations[state.conj] then
    		local rec = langSwitch(i18n.Translations[state.conj], lang)
    		if type(rec)=='table' then
    			case = rec.case
    		end
    	end
    	date1   = oneDatePhrase(date1, state.adj1, state.era1, state.units1, lang, 1, case[1], state)
    	date2   = oneDatePhrase(date2, state.adj2, state.era2, state.units2, lang, 2, case[2], state)
    	dateStr = translatePhrase(date1, date2, state.conj, lang, state)
    	if era ~= '' then
    		dateStr = translatePhrase(dateStr, '', era, lang, state)
    	end
    	return dateStr
    end
    
    -- =======================================================================
    local function otherPhrases(date1, date2, operation, era, lang, state)
    -- translate specialized phrases
    	local dateStr = ''
    		
    	if operation == 'islamic' then
    		if date2=='' then date2 = mw.getCurrentFrame():callParserFunction('#time', 'xmY', date1) end
    		date1 = getISODate(date1, operation, lang, 1, nil)
    		date2 = getISODate(date2, operation, lang, 2, nil)
    		if era == '' then era = 'ad' end
    		dateStr = translatePhrase(date1, '', era, lang, state) .. ' (' .. translatePhrase(date2, '', 'ah', lang, state) .. ')'
    		era = ''
    	elseif operation == 'julian' then
    		if not date2 and date1 then -- Convert from Julian to Gregorian calendar date
    			local JDN = Calendar._date2jdn(date1, 0)
    			if JDN then
    				date2 = date1 -- first date is assumed to be Julian
    				date1 = Calendar._jdn2date(JDN, 1)
    			end
    		end
    		date1 = getISODate(date1, operation, lang, 1, nil)
    		date2 = getISODate(date2, operation, lang, 2, nil)
    		dateStr = translatePhrase(date1, date2, operation, lang, state)
    		dateStr = mw.ustring.gsub(mw.ustring.gsub(dateStr, '%( ', '('), ' %)', ')') -- in case date2 is empty
    	elseif operation == 'turn of the year' or operation == 'turn of the decade' or operation == 'turn of the century' then 
    		local dt = 1;
    		if operation == 'turn of the decade' then dt=10 end
    		if not date2 or date2=='' then date2=tostring(tonumber(date1)-dt) end
    		if era~='bp' and era~='bc' then date1, date2 = date2, date1 end
    		if operation == 'turn of the year' then
    			date1 = ISOdate(date1, lang, '', '', 1)
    			date2 = ISOdate(date2, lang, '', '', 1)
    		else
    			date1 = formatnum1(date1, lang)
    			date2 = formatnum1(date2, lang)
    		end
    		dateStr = translatePhrase(date1, date2, operation, lang, state)
    	elseif operation == 'year unknown' then
    		dateStr = translatePhrase('', '', operation, lang, state) .. '<div style="display: none;">Unknown date</div>'
    	elseif operation == 'unknown' then
    		dateStr = tostring(mw.message.new( "exif-unknowndate" ):inLanguage( lang )) .. '<div style="display: none;">Unknown date</div>'
    	end
    	
    	-- add era
    	if era ~= '' then
    		dateStr = translatePhrase(dateStr, '', era, lang, state)
    	end
    	return dateStr
    end
    
    -- =======================================================================
    local function checkAliases(str1, str2, sType)
    -- some inputs have many aliases - reconcile them and ensure string is playing a proper role	
    local out = ''
    if str1 and str1~='' then
    	local a = i18n.Synonyms[str1] -- look up synonyms of "str1"
    	if a then
    		out = a[1]
    	else
    		p.Error = string.format('<span style="background-color:red;">Error in [[Module:Complex date]]: %s is not recognized.</span>', str1)
    	end
    elseif str2 and str2~='' then -- if "str1" of type "sType" is empty than maybe ...
    	local a = i18n.Synonyms[str2]   -- ..."str2" is of the same type and is not empty
    	if a and a[2]==sType then
    		out  = a[1]
    		str2 = ''
    	end
    end
    return out, str2
    end
    
    -- =======================================================================
    local function datePrecision(dateStr, units)	
    -- "in this module "Units" is a string like millennium, century, or decade
    --	"precision" is wikibase compatible date precision number: 6=millennium, 7=century, 8=decade, 9=year, 10=month, 11=day
    -- based on string or numeric input calculate "Units" and "precision"
    	local precision
    	local dateNum = tonumber(dateStr);
    	if type(units)=='number' then
    		precision = units
    		if precision>11 then precision=11 end -- clip the range of precision values
    		if     precision==6 then units='millennium' 		
    		elseif precision==7 then units='century'
    		elseif precision==8 then units='decade'
    		else units = ''
    		end
    	elseif type(units)=='string' then
    		units = string.lower(units);
    		if     units=='millennium' then precision=6
    		elseif units=='century'    then precision=7
    		elseif units=='decade'     then precision=8
    		else precision=9
    		end
    	end
    	if units=='' or precision==9 then
    		local sLen = mw.ustring.len(dateStr)
    		if     sLen<= 4 then precision=9
    		elseif sLen== 7 then precision=10
    		elseif sLen>=10 then precision=11
    		end
    		units=''
    	end
    	if precision==6 and dateStr.match( dateStr, '%d000' )~=nil then 
    		dateStr = tostring(math.floor(tonumber(dateStr)/1000) +1)
    	elseif precision==7 and mw.ustring.match( dateStr, '%d%d00' )~=nil then
    		dateStr = tostring(math.floor(tonumber(dateStr)/100) +1)
    	end
    
    	return dateStr, units, precision
    end
    
    -- =======================================================================
    local function isodate2timestamp(dateStr, precision, era)
    -- convert date string to timestamps used by Quick Statements
    	local tStamp = nil
    	if era == 'ah' or precision<6 then
    		return nil
    	elseif era ~= '' then
    		local eraLUT = {ad='+', bc='-', bp='-' }
    		era = eraLUT[era]
    	else
    		era='+'
    	end
    
    -- convert isodate to timestamp used by quick statements
    	if precision>=9 then 
    		if string.match(dateStr,"^%d%d%d%d$") then               -- if YYYY  format 
    			tStamp = era .. dateStr .. '-00-00T00:00:00Z/9'
    		elseif string.match(dateStr,"^%d%d%d%d%-%d%d$") then      -- if YYYY-MM format 
    			tStamp = era .. dateStr .. '-00T00:00:00Z/10'
    		elseif string.match(dateStr,"^%d%d%d%d%-%d%d%-%d%d$") then  -- if YYYY-MM-DD format 
    			tStamp = era .. dateStr .. 'T00:00:00Z/11'
    		end
    	elseif precision==8 then -- decade
    		tStamp = era .. dateStr .. '-00-00T00:00:00Z/8'
    	elseif precision==7 then -- century
    		local d = tostring(tonumber(dateStr)-1)
    		tStamp = era .. d .. '50-00-00T00:00:00Z/7'
    	elseif precision==6 then
    		local d = tostring(tonumber(dateStr)-1)
    		tStamp = era .. d .. '500-00-00T00:00:00Z/6'
    	end
    	
    	return tStamp
    end
    
    -- =======================================================================
    local function oneDateQScode(dateStr, adj, era, precision)
    -- create QuickStatements string for "one date" dates
    	local outputStr = ''
    
    	local d = isodate2timestamp(dateStr, precision, era)
    	if not d then
    		return ''
    	end
    	local rLUT = {            early='Q40719727'     , mid='Q40719748',      late='Q40719766',
    		['1quarter']='Q40690303' , ['2quarter']='Q40719649'  , ['3quarter']='Q40719662', ['4quarter']='Q40719674',
    		spring='Q40720559'   , summer='Q40720564'    , autumn='Q40720568'  , winter='Q40720553',
    		firsthalf='Q40719687', secondhalf='Q40719707' }
    	local qLUT = {['from']='P580', ['until']='P582', ['after']='P1319', ['before']='P1326', ['by']='P1326'}
    
    	local refine = rLUT[adj]
    	local qualitier = qLUT[adj]
    
    	if adj=='' then
    		outputStr = d
    	elseif adj=='circa' then
    		outputStr = d..",P1480,Q5727902"
    	elseif refine then
    		outputStr = d..",P4241,"..refine
    	elseif precision>7 and qualitier then
    		local century = string.gsub(d, 'Z%/%d+', 'Z/7')
    		outputStr = century ..",".. qualitier ..","..d
    	end
    	return outputStr 
    end
    
    -- =======================================================================
    local function twoDateQScode(date1, date2, state)
    -- create QuickStatements string for "two date" dates
    	if state.adj1~='' or state.adj2~='' or state.era1~=state.era2 then
    		return '' -- QuickStatements string are not generated for two date phrases with adjectives
    	end
    	local outputStr = ''
    	local d1 = isodate2timestamp(date1, state.precision1, state.era1)
    	local d2 = isodate2timestamp(date2, state.precision2, state.era2)
    	if (not d1) or (not d2) then
    		return ''
    	end	
    	-- find date with lower precision in common to both dates
    	local cd
    	local year1 = tonumber(string.sub(d1,2,5))
    	local year2 = tonumber(string.sub(d2,2,5))
    	local k = 0
    	for i = 1,10,1 do 
    		if string.sub(d1,1,i)==string.sub(d2,1,i) then 
    			k = i -- find last matching letter
    		end
    	end
    	if k>=9 then              -- same month, since "+YYYY-MM-" is in common
    		cd = isodate2timestamp(string.sub(d1,2,8), 10, state.era1)
    	elseif k>=6 and k<9 then  -- same year, since "+YYYY-" is in common
    		cd = isodate2timestamp(tostring(year1), 9, state.era1)
    	elseif k==4 then          -- same decade(k=4, precision=8),  since "+YYY" is in common
    		cd = isodate2timestamp(tostring(year1), 8, state.era1)
    	elseif k==3 then          -- same century(k=3, precision=7) since "+YY" is in common
    	  local d = tostring(math.floor(year1/100) +1) -- convert 1999 -> 20
    		cd = isodate2timestamp( d, 7, state.era1)
    	elseif k==2 then          -- same millennium (k=2, precision=6),  since "+Y" is in common
    		local d = tostring(math.floor(year1/1000) +1) -- convert 1999 -> 2
    		cd = isodate2timestamp( d, 6, state.era1)
    	end
    	if not cd then
    		return ''
    	end
    	--if not cd then
    	--	return ' <br/>error: ' .. d1.." / " .. d2.." / ".. (cd or '') .." / ".. string.sub(d1,2,5).." / " .. string.sub(d2,2,5).." / " .. tostring(k)
    	--end
    
    	--
    	if (state.conj=='from-until') or (state.conj=='and' and year1==year2-1) then
    		outputStr = cd ..",P580,".. d1 ..",P582,".. d2
    	elseif (state.conj=='between') or (state.conj=='or' and year1==year2-1) then
    		outputStr = cd ..",P1319,".. d1 ..",P1326,".. d2
    	elseif state.conj=='circa2' then
    		outputStr = cd ..",P1319,".. d1 ..",P1326,".. d2 ..",P1480,Q5727902"
    	end
    
    	return outputStr
    end
    
    -- =======================================================================
    local function processInputParams(conj, adj1, date1, units1, era1, adj2, date2, units2, era2, lang, passNr)
    
      -- process inputs and save date in state array
    	local state  = {}
    	state.conj   = string.lower(conj   or '')
    	state.adj1   = string.lower(adj1   or '')
    	state.adj2   = string.lower(adj2   or '')
    	state.era1   = string.lower(era1   or '')
    	state.era2   = string.lower(era2   or '')
    	state.units1 = string.lower(units1 or '')
    	state.units2 = string.lower(units2 or '')
    		  
    	-- if date 1 is missing but date 2 is provided than swap them
    	if date1 == '' and date2 ~= '' then
    		date1 = date2
    		date2 = ''
    		state = {adj1 = state.adj2, era1 = state.era2, units1 = state.units2, 
    		         adj2 = '',         era2 = '',         units2 = '',  conj=state.conj, num=1}
    	end
    	if     date2 ~= '' then state.nDates = 2 
    	elseif date1 ~= '' then state.nDates = 1 
    	else	                state.nDates = 0
    	end
    	
    	-- reconcile alternative names for text inputs
    	local conj         = checkAliases(state.conj ,''  ,'j')
    	state.adj1 ,conj   = checkAliases(state.adj1 ,conj,'a')
    	state.units1,conj  = checkAliases(state.units1,conj,'p')
    	state.era1 ,conj   = checkAliases(state.era1 ,conj,'e')
    	state.special,conj = checkAliases('',conj,'c')
    	state.adj2         = checkAliases(state.adj2 ,'','a')
    	state.units2       = checkAliases(state.units2,'','p')
    	state.era2         = checkAliases(state.era2 ,'','e')
    	state.conj         = conj
    	state.lang         = lang
    	if p.Error~=nil then
    		return nil
    	end
    	
    	-- calculate date precision value
    	date1, state.units1, state.precision1 = datePrecision(date1, state.units1)
    	date2, state.units2, state.precision2 = datePrecision(date2, state.units2)
    
    	-- Handle special cases 
    	-- Some complex phrases can be created out of simpler ones. Therefore on pass # 1 we try to create 
    	-- the phrase using complex phrase and if that is not found than on the second pass we try to build
    	-- the phrase out of the simpler ones
    	if passNr==1 then
    		if state.adj1=='circa' and state.nDates == 2 then
    			state.conj = 'circa2'
    			state.adj1 = ''
    			state.adj2 = ''
    		end
    		if state.nDates == 2 and state.adj1=='late' and state.adj2=='early' and state.conj=='and' 
    		and state.units1==state.units2 and state.era1==state.era2 then
    			if state.units1=='century' then
    				state.conj='turn of the century'
    			elseif state.units1=='decade' then
    				state.conj='turn of the decade'
    			elseif state.units1=='' then
    				state.conj='turn of the year'
    			end
    			state.adj1 = ''
    			state.adj2 = ''
    			state.units1 = ''
    			state.units2 = ''
    		end
    	end
    
    	state.adj, state.era, state.units, state.precision = state.adj1, state.era1, state.units1, state.precision1 
    	return date1, date2, state
    end
    
    -- ==================================================
    -- === External functions ===========================
    -- ==================================================
    
    function p.Era(frame)
        -- process inputs
    	local dateStr
    	local args    = frame.args
    	if not (args.lang and mw.language.isSupportedLanguage(args.lang)) then 
    		args.lang = frame:callParserFunction( "int", "lang" ) -- get user's chosen language  
    	end
    	local lang    = args['lang']
    	local dateStr = args['date'] or ''
    	local eraType = string.lower(args['era']  or '')
    
    	dateStr = ISOdate(dateStr, lang, '', '', 1)
    	if eraType then 
    		eraType = checkAliases(eraType ,'','e')
    		dateStr = translatePhrase(dateStr, '', eraType, lang, {}) 
    	end
    	return dateStr
    end
    	
    -- =======================================================================
    function p._complex_date(conj, adj1, date1, units1, era1, adj2, date2, units2, era2, lang, passNr)
    	local Output=''
    	local state
    
      -- process inputs and save date in state array
    	date1, date2, state  = processInputParams(conj, adj1, date1, units1, era1, adj2, date2, units2, era2, lang, passNr) 
    	if p.Error~=nil then
    		return nil
    	end
    
    	local errorStr = string.format(
    	 '\n*conj=%s, adj1=%s, era1=%s, unit1=%s, prec1=%i, adj2=%s, era2=%s, unit2=%s, prec2=%i, special=%s', 
    	  state.conj, state.adj1, state.era1, state.units1, state.precision1,
    	  state.adj2, state.era2, state.units2, state.precision2, state.special)  
    
    	-- call specialized functions
    	local QScode = ''
    	if state.special~='' then
    		Output = otherPhrases(date1, date2, state.special, state.era1, lang, state)	
    	elseif state.conj~='' then
    		QScode = twoDateQScode(date1, date2, state)
    		Output = twoDatePhrase(date1, date2, state, lang)
    	elseif state.adj1~='' or state.era1~='' or state.units1~='' then
    		Output = oneDatePhrase(date1, state.adj1, state.era1, state.units1, lang, 1, nil, state)
    		QScode = oneDateQScode(date1, state.adj1, state.era1, state.precision1)
    	elseif date1~='' then
    		Output = ISOdate(date1, lang, '', 'dtstart', '100-999')
    	end
    	if p.Error~=nil then
    		return errorStr
    	end
    
    	-- if there is any wikicode in the string than execute it
    	if mw.ustring.find(Output, '{') then
    		Output = mw.getCurrentFrame():preprocess(Output)
    	end
    	if QScode and #QScode>0 then
    		QScode = ' <div style="display: none;">date QS:P,' .. QScode .. '</div>'
    	end
    
    	return Output .. QScode
    end
    
    -- =======================================================================
    function p._complex_date_cer(conj, adj1, date1, units1, era1, adj2, date2, units2, era2, certainty, lang)
    -- same as p._complex_date but with extra parameter for certainty: probably, possibly, presumably, etc.
    	local dateStr = p._complex_date(conj, adj1, date1, units1, era1, adj2, date2, units2, era2, lang, 1)
    	certainty = checkAliases(certainty, conj, 'r')
    	local LUT = {probably='Q56644435',  presumably='Q18122778', possibly='Q30230067', circa='Q5727902' }
    	if certainty and LUT[certainty] then
    		local state  = {} 
    		date1, date2, state  = processInputParams(conj, adj1, date1, units1, era1, adj2, date2, units2, era2, lang, 1) 	
    		dateStr = translatePhrase(dateStr, '', certainty, lang, state)
    		dateStr = string.gsub(dateStr, '(%<div style="display: none;"%>date QS:P,[^%<]+)(%</div%>)', '%1,P1480,' .. LUT[certainty] .. '%2' )
    	end
    	return dateStr
    end
    
    -- =======================================================================
    function p.complex_date(frame)
        -- process inputs
    	local dateStr, Error
    	local args   = frame.args
    	if not (args.lang and mw.language.isSupportedLanguage(args.lang)) then 
    		args.lang = frame:callParserFunction( "int", "lang" ) -- get user's chosen language  
    	end
    	local date1  = args['date1'] or args['2'] or args['date'] or ''
    	local date2  = args['date2'] or args['3'] or ''
    	local conj   = args['conj']  or args['1'] or ''
    	local adj1   = args['adj1']  or args['adj'] or ''
    	local adj2   = args['adj2'] or ''
    	local units1 = args['precision1'] or args['precision'] or ''
    	local units2 = args['precision2'] or args['precision'] or ''
    	local era1   = args['era1'] or args['era'] or ''
    	local era2   = args['era2'] or args['era'] or ''
    	local certainty = args['certainty']
    	local lang   = args['lang']
    
    	dateStr = p._complex_date_cer(conj, adj1, date1, units1, era1, adj2, date2, units2, era2, certainty, lang)
    	if p.Error~=nil then
    		dateStr = p.Error .. '[[Category:Pages using Complex date template with incorrect parameter]]'
    	end
    	return dateStr
    end
    
    return p