Lua星期推算：基姆拉尔森公式的一天定位

local function weekDay(y, m, d)
    if m < 3 then
        m = m + 12
        y = y - 1
    end
    local w = (d + 2 * m
        + math.floor(3 * (m + 1) / 5)
        + y + math.floor(y / 4)
        - math.floor(y / 100)
        + math.floor(y / 400)) % 7 + 1
    return w
end

local names = {"一", "二", "三", "四", "五", "六", "日"}
local p = getplayerbyname("week01")
sendmsg(p, 1, "2026-09-27 是周"
    .. names[weekDay(2026, 9, 27)])
sendmsg(p, 1, "2000-01-01 是周"
    .. names[weekDay(2000, 1, 1)])