org-evaluate-time-range
org-evaluate-time-range is an interactive compiled Lisp function in `org.el
'.
(org-evaluate-time-range &optional TO-BUFFER)
Evaluate a time range by computing the difference between start and end.
Normally the result is just printed in the echo area, but with prefix arg
TO-BUFFER, the result is inserted just after the date stamp into the buffer.
If the time range is actually in a table, the result is inserted into the
next column.
For time difference computation, a year is assumed to be exactly 365
days in order to avoid rounding problems.