There are two parts to the flow.....
(Well, a lot more but I shall keep it as simple as possible.)
There are foreign nodes - sorry - but they don't do that much important.
The idea:
Normally every n seconds a pulse happens. A file is written to with the time and how long the machine has been running.
The machine boots.
This file is moved/renamed to a file which has the date/time in its name.
Then the original file I mentioned above is re-created with how long it has been running.
I thought I had it working, but today the machine had locked up and I had to power cycle it. 
(Headless.)
It booted but after it did all that, the file which was renamed/moved is empty.
I have changed a bit (see comment node read me for what I did.)
So here is the bits of the flow.
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Menu","icon":"list","order":1,"disabled":false,"hidden":false}]
The only external thing you will see is at the top of the nodes link in is the pulse that is used as the signal to generate the time stamp.
There are a couple of disabled nodes which are because I am playing with CSS and those nodes have been superseded.
There is a lot of debug stuff. That is the lower right part. The queue nodes.
In the middle there are two gate nodes. Old way and New way.
(See the Read Me)
Basically the output from my subflow timestamp node started the timer node to turn on the gate node that allows writing to the last alive file. (Top right of the flow)
But I decided to maybe take the output signal from the move node that Moves (renames) the file.
Still not tested.
Thanks in advance and I hope you understand what I want to do and how/why.
