Lua script sometimes doesn't save values in the file - lua

Question

I made a Timer script for Minecraft that should display the time spent in the game. You can pause resume and reset the time. My next step was to make it able to save the time in a file called timesave.txt but sometimes it isn't saving the time and its just empty... If it saves the time it reads and uses it to restore the old time.
This is the code:
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-------------
timesaved = 0
stopTime = 0
startTime = 0
f = io.input("timesave.txt")
resultstop = f :read("*line")
resultstart = f :read("*line")
f :close()
startTime = resultstop
stopTime = resultstart
timesaved = resultstart - resultstop
state = 2
function keyboard(key, isDown)
if (isDown == true) then
if (key == RESET_KEY) then
f = io.input("timesave.txt")
resultstart = f :read("*line")
resultstop = f :read("*line")
f :close()
startTime = resultstop
stopTime = resultstart
timesaved = resultstart - resultstop
state = 0
elseif (key == START_STOP_KEY) then
if (state == 0) then
state = 1
startTime = os.time() - timesaved
io.output("timesave.txt")
timesave= (io.open("timesave.txt","w"))
io.write(startTime,'\n',stopTime)
io.close(timesave)
elseif (state == 1) then
state = 2
stopTime = os.time()
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

Add io.flush() or timesave:flush() after your write operation to save the written data to the file.
See https://www.lua.org/manual/5.3/manual.html#pdf-file:flush