how to get a Matlab timestamp in floating point (data type double) seconds

Question

I need a function that returns a timestamp, in seconds, as a Matlab double (floating point) value. ie. I want a function present_seconds() to return the present time, in seconds, as a Matlab double value.

Timestamp can be elapsed CPU seconds, or seconds of epoch. (I'm using it as a relative value.)

Answer 1

function p = present_seconds
    p = 3600 * 24 * now;
end