From bug-request at octave dot org Sat Jan  7 16:53:04 2006
Subject: Re: etime in the new year
From: Stefan van der Walt <stefan at sun dot ac dot za>
To: Keith Goodman <kwgoodman at gmail dot com>
Cc: bug at octave dot org
Date: Sun, 8 Jan 2006 01:00:41 +0200

I saw formulas to calculate this thing in popular science magazines
before (Scientific American?).  I'm sure there must be a relatively
simple way to accomplish this?

Cheers
Stéfan

On Tue, Jan 03, 2006 at 12:29:16PM -0600, Keith Goodman wrote:
> The function etime (elapsed time in seconds) returns an error when you
> compare times with different years. From the code
> 
> if (t1 (1) != t0 (1))
>    error ("etime: can't handle timings over year boundaries yet");
> endif
> 
> Is that because it's painful to deal with leap years? What's the best fix?
> 
> (1) Write a separate function to find if a year is a leap year.
> (2) Determine if a year is a leap year inside etime.
> (3) Bring over datenum from octave-forge and modify it to handle leap
> years and then use it for year, month, and day differences but not
> fractional parts of days.



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