Lua timer script producing all-numeric value instead of proper time - math

Question

My timer script writes this into the file when it saves the value.
Example Time in file: 1638185640
Example of time displayed in game:
name = "Timer"
description = "Just a normal Timer."
positionX = 0
positionY = 0
sizeX = 24
sizeY = 10
scale = 1
START_STOP_KEY = 0x55 --or 'U'
RESET_KEY = 0x4A --or 'J'
--
--[[
Timer Module Script by SebyGHG original script by Onix64(Stopwatch)
if you wish to change the key you can take the key code from here
https://learn.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes
]] -------------script-code-------------
state = 1
stopTime = 0
startTime = 0
f = io.input("timesave.txt")
result = f :read()
f :close()
stopTime = result
state = 2
function keyboard(key, isDown)
if (isDown == true) then
if (key == RESET_KEY) then
state = 0
elseif (key == START_STOP_KEY) then
if (state == 0) then
state = 1
startTime = os.time()
elseif (state == 1) then
state = 2
io.output("timesave.txt")
timesave= (io.open("timesave.txt","w"))
io.write(stopTime)
io.close(timesave)
stopTime = os.time() -stopTime
elseif (state == 2) then
state = 1
startTime =startTime + os.time() - stopTime
end
end
end
end
TimerText = "00:00"
TextColor = {r = 30, g = 255, b = 30, a = 255}
function doubleDigit(number)
if (number < 10) then
return "0" .. math.floor(number)
else
return math.floor(number)
end
end
function timeText(time)
local result = ""
local days = 0
while (time > 86399) do
days = days + 1
time = time - 86400
end
local hours = 0
while (time > 3599) do
hours = hours + 1
time = time - 3600
end
local minutes = 0
while (time > 59) do
minutes = minutes + 1
time = time - 60
end
if (days == 0) then
if (hours == 0) then
return doubleDigit(minutes) .. ":" .. doubleDigit(time)
else
return math.floor(hours) .. " : " .. doubleDigit(minutes) .. ":" .. doubleDigit(time)
end
else
return math.floor(days) ..
" : " .. doubleDigit(hours) .. " : " .. doubleDigit(minutes) .. ":" .. doubleDigit(time)
end
end
function update()
if (state == 0) then
TextColor = {r = 255, g = 0, b = 0, a = 255}
TimerText = "00:00"
elseif (state == 1) then
TimerText = timeText(os.time() - startTime)
TextColor = {r = 0, g = 255, b = 255, a = 255}
elseif (state == 2) then
TimerText = timeText(stopTime - startTime)
TextColor = {r = 255, g = 255, b = 0, a = 255}
end
end
function render()
local font = gui.font()
local tw = font.width(TimerText)
gfx.color(0, 0, 0, 0)
gfx.rect(0, 0, tw + 4, 10)
gfx.color(TextColor.r, TextColor.g, TextColor.b, TextColor.a)
gfx.text(2, 1, TimerText)
end

Answer 1

It looks like you are saving the Unix Timestamp to your file, you can try and make it human readable using an online time converter (https://time.is/Unix_time_converter)
Besides this, take some time to read the os.time() implementation details on this lua page: https://www.lua.org/pil/22.1.html
The time function, when called without arguments, returns the current date and time, coded as a number. (In most systems, that number is the number of seconds since some epoch.)
If you want the time in between certain action, save the initial timestamp and diff it at the end of the action. This is natively supported in lua using os.difftime(). (http://www.lua.org/manual/5.3/manual.html#pdf-os.difftime)