different date/time representations

[Andreas Weber]

Dear all,

Since I'm always baffled because the different representations for
date/time in GNU Octave (serial day number, date vector, time structure
and so on) I made a graphic to help me when dealing with date/time:

http://www.tech-chat.de/images/GNU_Octave_date_time.svg

Am I missing something? Should I add this to the wiki?

And is there a direct way from "seconds since the epoch" to "serial day
number"?
A function like:

tm = localtime (t);
ret = datenum (tm.year + 1900, tm.mon + 1, tm.mday, tm.hour, tm.min,
tm.sec + tm.usec / 1e6)

Thanks, Andy