Lua日期差：两天相隔的天数推算

local function daysBetween(y1, m1, d1, y2, m2, d2)
    local t1 = os.time({year = y1, month = m1,
        day = d1, hour = 0})
    local t2 = os.time({year = y2, month = m2,
        day = d2, hour = 0})
    return math.floor((t2 - t1) / 86400)
end

local function countdown(actor, y, m, d)
    local left = daysBetween(
        tonumber(os.date("%Y")), tonumber(os.date("%m")),
        tonumber(os.date("%d")), y, m, d)
    if left > 0 then
        sendmsg(actor, 1, "距活动还有 " .. left .. " 天")
    else
        sendmsg(actor, 1, "活动已开始或已结束")
    end
end
local p = getplayerbyname("date01")
countdown(p, 2026, 10, 20)