What is "seconds with milliseconds resolution"

[Mark McDonnell]

Hello,

I'm not sure I really understand the `msec` embedded variable.

I'm getting the value back as `1474452771.178`

It's described as "seconds with milliseconds resolution", but I'm not sure
what that really means (maths isn't a strong skill for me).

How do I convert the number into seconds?
So I can get a better idea of the relation of this value.

Thanks

M.
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