local p = {}  -- Returns the expiry of a restriction of an action on a given title, or unknown if it cannot be known. -- If no title is specified, the title of the page being displayed is used. function p._main(action, pagename)  local title  if type(pagename) == 'table' and pagename.prefixedText then  title = pagename  elseif pagename then  title = mw.title.new(pagename)  else  title = mw.title.getCurrentTitle()  end  pagename = title.prefixedText  if action ~= 'edit' and action ~= 'move' and action ~= 'create' and action ~= 'upload' then  error( 'First parameter must be one of edit, move, create, upload', 2 )  end  local rawExpiry = mw.getCurrentFrame():callParserFunction('PROTECTIONEXPIRY', action, pagename)  if rawExpiry == 'infinity' then  return 'infinity'  elseif rawExpiry == '' then  return 'unknown'  else  local year = mw.ustring.sub( rawExpiry, 1, 4 )  local month = mw.ustring.sub( rawExpiry, 5, 6 )  local day = mw.ustring.sub( rawExpiry, 7, 8 )  return year .. '-' .. month .. '-' .. day  end end  setmetatable(p, { __index = function(t, k)  return function(frame)  return t._main(k, frame.args[1])  end end })  return p