Moduł:WiekLataDni

local p = {}

local function trim(v) if v == nil then return nil end v = tostring(v):match("^%s*(.-)%s*$") if v == "" then return nil end return v end

local function isLeap(y) return (y % 4 == 0 and y % 100 ~= 0) or (y % 400 == 0) end

local function daysInMonth(y, m) local t = {31,28,31,30,31,30,31,31,30,31,30,31} if m == 2 and isLeap(y) then return 29 end return t[m] end

local function isValidDate(y, m, d) if not y or not m or not d then return false end if m < 1 or m > 12 then return false end if d < 1 or d > daysInMonth(y, m) then return false end return true end

local function daysBeforeYear(y) y = y - 1 return 365 * y + math.floor(y / 4) - math.floor(y / 100) + math.floor(y / 400) end

local function serialDay(y, m, d) local n = d for i = 1, m - 1 do n = n + daysInMonth(y, i) end return daysBeforeYear(y) + n end

local function pluralYears(n) local mod10 = n % 10 local mod100 = n % 100

if mod10 == 1 and mod100 ~= 11 then return "rok" elseif mod10 >= 2 and mod10 <= 4 and not (mod100 >= 12 and mod100 <= 14) then return "lata" else return "lat" end end

local function pluralDays(n) if n == 1 then return "dzień" end return "dni" end

local function getCurrentDate(frame) local y = tonumber(frame:preprocess("2026")) local m = tonumber(frame:preprocess("07")) local d = tonumber(frame:preprocess("21")) return y, m, d end

local function getArgs(frame) local parent = frame:getParent() local src = frame.args

if parent and next(parent.args) then src = parent.args end

local args = {} for k, v in pairs(src) do args[k] = trim(v) end return args end

function p.policz(frame) local args = getArgs(frame)

local y1 = tonumber(args[1] or args.rok1 or args.rok) local m1 = tonumber(args[2] or args.miesiac1 or args.miesiąc1 or args.miesiac or args.miesiąc) local d1 = tonumber(args[3] or args.dzien1 or args.dzień1 or args.dzien or args.dzień)

local y2 = tonumber(args[4] or args.rok2) local m2 = tonumber(args[5] or args.miesiac2 or args.miesiąc2) local d2 = tonumber(args[6] or args.dzien2 or args.dzień2)

if not isValidDate(y1, m1, d1) then return '' end

if y2 or m2 or d2 then if not isValidDate(y2, m2, d2) then return '' end else y2, m2, d2 = getCurrentDate(frame) end

local startSerial = serialDay(y1, m1, d1) local endSerial = serialDay(y2, m2, d2)

if endSerial < startSerial then return '' end

local years = y2 - y1 local annivDayInEndYear = math.min(d1, daysInMonth(y2, m1))

if (m2 < m1) or (m2 == m1 and d2 < annivDayInEndYear) then years = years - 1 end

local annivYear = y1 + years local annivDay = math.min(d1, daysInMonth(annivYear, m1)) local anniversarySerial = serialDay(annivYear, m1, annivDay)

local days = endSerial - anniversarySerial

return years .. " " .. pluralYears(years) .. " i " .. days .. " " .. pluralDays(days) end

return p