mymonths/months.lua

local timechange = 0
local gm = 0
local gn = 0
local timescale = 72
-- If exists read timescale from config and store locally to prevent outside modification
if mymonths.timescale ~= nil then
	timescale = mymonths.timescale
end	

-- Set holidays
local hol = {
	{"12", 14, "It is New Years Eve!"},
	{"1",  1,  "It is New Years Day!"},
	{"3",  12, "It is Friendship Day!"},
	{"6",  5,  "It is Minetest Day!"},
	{"4",  10, "It is Miners Day!"},
	{"8",  12, "It is Builders Day!"},
	{"10", 8,  "It is Harvest Day!"},
}

-- Set days
local days = {
	{1, 8,  "Monday"},
	{2, 9,  "Tuesday"},
	{3, 10, "Wednesday"},
	{4, 11, "Thursday"},
	{5, 12, "Friday"},
	{6, 13, "Saturday"},
	{7, 14, "Sunday"},
}

-- this stops undeclared variable errors
local t1, t2, t3, t4, t5 = 0, 0, 0, 0, 0

-- Set months
local mon = {
	{1,  "January",  t5, t1, .9},
	{2,  "February", t5, t1, .9},
	{3,  "March",    t4, t2, 1},
	{4,  "April",    t4, t2, 1},
	{5,  "May",      t3, t3, 1},
	{6,  "June",     t3, t3, 1.1},
	{7,  "July",     t1, t5, 1.2},
	{8,  "August",   t1, t5, 1.5},
	{9,  "September",t3, t3, 1},
	{10, "October",  t3, t3, 1},
	{11, "November", t4, t2, .9},
	{12, "December", t4, t2, .9},
}

-- Sets Month and length of day
local timer = 0

minetest.register_globalstep(function(dtime)

	-- Checks every X seconds
	timer = timer + dtime

	--do not change because it will effect other values
	if timer < 3 then
		return
	end

	timer = 0

--Day Night Speeds (Thanks to sofar for this)
	local dc = tonumber(mymonths.day_counter)
	local mc = tonumber(mymonths.month_counter)
	local x = ((mc-1)*14)+dc
	local ratio = ((math.cos((x / 168) * 2 * math.pi) * 0.8) / 2.0) + 0.5
	local nightratio = math.floor(timescale * (ratio + 0.5))
	local dayratio =  math.floor(timescale / (ratio + 0.5))

	--Checks for morning
	local time_in_seconds = minetest.get_timeofday() * 24000

	if time_in_seconds >= 12001
	and timechange == 0 then

		timechange = 1
		gm = 1
	end

	if time_in_seconds <= 12000
	and timechange == 1 then

		timechange = 0
		mymonths.day_counter = mymonths.day_counter + 1
	end

	if mymonths.day_counter >= 15 then
		mymonths.month_counter = mymonths.month_counter + 1
		mymonths.day_counter = 1
	end

	if tonumber(mymonths.month_counter) == nil then
		mymonths.monthcounter = 6

	elseif tonumber(mymonths.month_counter) >= 13 then
		mymonths.month_counter = 1
		mymonths.day_counter = 1
	end

	-- Sets time speed in the morning
	if time_in_seconds >= 6000
	and time_in_seconds <= 12000
	and gm == 1 then
		minetest.setting_set("time_speed", dayratio)
		minetest.chat_send_all("Good Morning! It is "..mymonths.day_name.." "..mymonths.month.." "..mymonths.day_counter)
		--minetest.chat_send_all("Time speed is "..dayratio.." and "..nightratio)

		---Holidays
		for i in ipairs(hol) do

			local h1 = hol[i][1]
			local h2 = hol[i][2]
			local h3 = hol[i][3]

			if mymonths.month_counter == h1
			and mymonths.day_counter == h2 then
				minetest.chat_send_all(h3)
			end
		end

		gm = 0
		gn = 1
	end

	--Months
	for i in ipairs(mon) do

		local m1 = mon[i][1]
		local m2 = mon[i][2]
		local m3 = mon[i][3]
		local m4 = mon[i][4]
		local m5 = mon[i][5]

		if mymonths.month_counter == m1 then

			mymonths.month = m2
			mymonths.day_speed = m3
			mymonths.night_speed = m4
		end
	end

	if time_in_seconds >= 22000
	and time_in_seconds <= 24000
	and gn == 1 then

		minetest.setting_set("time_speed", nightratio)

		gn = 0
	end

	-- Set the name of the day
	for i in ipairs(days) do

		local w1 = days[i][1]
		local w2 = days[i][2]
		local dy = days[i][3]

		if mymonths.day_counter == w1
		or mymonths.day_counter == w2 then

			mymonths.day_name = dy
		end
	end
end)