-- This module implements {{British regnal year}}. It converts a year in the Gregorian -- calendar to the equivalent English or British regnal year.  local data = mw.loadData( 'Module:British regnal year/data' )  local p = {}  function p.main( frame )  -- If we are being called from #invoke, then the year is the first positional  -- argument. If not, it is the frame parameter.  local inputYear  if frame == mw.getCurrentFrame() then  inputYear = frame:getParent().args[ 1 ]  local frameArgsYear = frame.args[ 1 ]  if frameArgsYear then  inputYear = frameArgsYear  end  else  inputYear = frame  end   -- Convert the input to an integer if possible. Return "N/A" if the input could  -- not be converted, or if the converted input is too big or too small.  if type( inputYear ) ~= 'number' then  inputYear = tonumber( inputYear )  end  if not inputYear then  return "''N/A''"  end  local currentYear = tonumber( mw.language.getContentLanguage():formatDate( 'Y' ) )  if inputYear < 1066 or inputYear > currentYear then  return "''N/A''"  end   -- Find the year in the data page and display the output.  for _, t in ipairs( data ) do  local dataYear = t.year  if inputYear >= dataYear then  -- Get data values from the data page.  local startYear = t.startYear  local currentRegnalYear = inputYear - dataYear + startYear  local linkCurrent = t.linkCurrent  local prevEndYear = t.prevEndYear  local linkPrev = t.linkPrev  local note = t.note   if inputYear > dataYear then  -- Years with the same monarch.  return mw.ustring.format(  '%d&nbsp;%s&nbsp;–&nbsp;%d&nbsp;%s%s',  currentRegnalYear - 1, linkCurrent, currentRegnalYear, linkCurrent, note or ''  )  elseif inputYear == dataYear and prevEndYear and linkPrev then  -- Years with a different monarch.  return mw.ustring.format(  '%d&nbsp;%s&nbsp;–&nbsp;%d&nbsp;%s%s',  prevEndYear, linkPrev, currentRegnalYear, linkCurrent, note or ''  )  else  -- This should only match the year 1066.  return mw.ustring.format(  '%d&nbsp;%s%s',  currentRegnalYear, linkCurrent, note or ''  )  end  end  end end  return p