So the timestep is set by
setmd time_step $dt
Now when you call
integrate $N
the system is propagated by
$N*$dt.
The total elapsed simulation time is tracked internally, you get (or set) it via
[setmd time]
So a convenient way of handling time in Espresso is to call
setmd time 0
before your integration loop and obtain the elapsed time also via [setmd time].
You should also know the conversion to SI time. For example, if your units are
Length: [Angstrom], Mass: [g/mol], Energy: [kJ/mol],
then you elapsed time in SI units is [setmd time]*100 fs.
Hope this helped,
Regards,
Konrad