I need help making a minutes seconds timer?

I need to make minutes seconds timer. I used the following code:

local timer = script.Parent
local minutes = 2
local seconds = 19

repeat
    if seconds <= 0 then
        minutes = minutes - 1
        seconds = 59
    else
        seconds = seconds - 1
    end
    if seconds <= 9  then
        timer.Text = tostring(minutes)..":0"..tostring(seconds)
    else
        timer.Text = tostring(minutes)..":"..tostring(seconds)
    end
    wait(1)
until minutes <= 0 and seconds <= 0

It worked but my timer resets when players resets his character. I need to make a timer when player resets his character or die it should not reset the timer.

Please help me.