如何在Lua中将ISO 8601持续时间转换为秒或毫秒？

function convertISO8601ToSeconds(duration)
    local years, months, days, hours, minutes, seconds = duration:match('P(%d+)Y(%d+)M(%d+)DT(%d+)H(%d+)M(%d+)S')
    
    local totalSeconds = 0
    
    if years then
        totalSeconds = totalSeconds + tonumber(years) * 365 * 24 * 3600
    end
    
    if months then
        totalSeconds = totalSeconds + tonumber(months) * 30 * 24 * 3600
    end
    
    if days then
        totalSeconds = totalSeconds + tonumber(days) * 24 * 3600
    end
    
    if hours then
        totalSeconds = totalSeconds + tonumber(hours) * 3600
    end
    
    if minutes then
        totalSeconds = totalSeconds + tonumber(minutes) * 60
    end
    
    if seconds then
        totalSeconds = totalSeconds + tonumber(seconds)
    end
    
    return totalSeconds
end

function convertISO8601ToMilliseconds(duration)
    local totalSeconds = convertISO8601ToSeconds(duration)
    local totalMilliseconds = totalSeconds * 1000
    
    return totalMilliseconds
end

local duration = 'P1Y2M3DT4H5M6S'
local seconds = convertISO8601ToSeconds(duration)
local milliseconds = convertISO8601ToMilliseconds(duration)

print('Duration in seconds:', seconds)
print('Duration in milliseconds:', milliseconds)