duration represents a period of time in fixed-length seconds (or minutes, hours,
or whatever you want to measure it in.)
duration has a resolution of about a nanosecond for typical dates. The underlying
representation is a
double representing the number of days elapsed, similar to a
datenum, except it’s interpreted as relative to some other reference point you provide,
instead of being relative to the Matlab/Octave epoch.
You can add or subtract a
duration to a
datetime to get another
You can also add or subtract
durations to each other.