Module:Calendar TOC

local p = {}

local start = [[
__NOTOC__<!--
--><div role="navigation" id="toc" class="toc plainlinks hlist" aria-labelledby="tocheading" style="text-align:left;">
<div id="toctitle" class="toctitle" style="text-align:center;"><span id="tocheading" style="font-weight:bold;">Contents</span></div>
<div style="margin:auto;white-space:nowrap;">
]]

local close = [[</div></div>]]

local function getYear(s,y)
	if y and mw.ustring.match(y, '^%d+$') then
		return y
	end
	y = mw.ustring.gsub(s, '^.-(%d+).-$', '%1')
	return y
end

local function getMonth(s,m)
	local mnames = {
		['January']=1,
		['February']=2, 
		['March']=3,
		['April']=4,
		['May']=5,
		['June']=6,
		['July']=7,
		['August']=8,
		['September']=9,
		['October']=10,
		['November']=11,
		['December']=12
	}
	if m and mnames[m] then
		return m
	end
	
	for k,n in pairs(mnames) do
		if mw.ustring.match(s or '', k) then
			return k
		end
	end
	
	return ''
end

function p.main(frame)
	local current_title = mw.title.getCurrentTitle()
	local pagename = current_title.text
	local content = current_title:getContent()
	local args = frame.args
	local pargs = frame:getParent().args
	
	if not content then
		error "The current page has no content"
	end
	
	local month = getMonth(pagename, args['month'] or pargs['month'] or '')
	local year = getYear(pagename, args['year'] or pargs['year'] or '')
	
	local days = {}
	-- Find uppermost headers containing the days of the month.
	for day in content:gmatch "%f[^\n]==%s*(%d)%s*" + month + "%s*==%f[^=]" do
		days[day] = 'df'
	end
	for day in content:gmatch "%f[^\n]==%s*" + month + "%s*(%d)%s*==%f[^=]" do
		days[day] = 'mf'
	end
	
	local extra = args['extra'] or pargs['extra'] or ''
	local footerlinks = {}
	if extra ~= '' then
		footerlinks = mw.text.split(extra, '%s*=%s*')
	else
		footerlinks = {"Unknown date", "See also", "References", "Notes", "Further reading", "External links"}
	end

	local footer = {}
	for k,v in ipairs(footerlinks) do
		if content:gmatch "%f[^\n]==%s*" + v + "%s*==%f[^=]" then
			table.insert(footer, v)
		end
	end
	
	local entries = { ';' + month + ':'}
	for d = 1,31 do
		if days[d] then
			if days[d] == 'df' then
				table.insert(entries, ': [[#' + d + ' ' + month + '|' + d + ']]')
			elseif days[d] == 'mf' then
				table.insert(entries, ': [[#' + month + ' ' + d + '|' + d + ']]')
			end
		end
	end
	for k,v in ipairs(footer) do
		table.insert(entries, ': [[#' + v + '|' + v + ']]')
	end
	
	return start .. entries:concat("\n") .. "\n\n" .. rest:concat("\n") .. close
end

return p
Module:Calendar TOC

Usage
