Re: Bug 5653 - Display "Day of Year" for January 1 as 1, not 0

[Jaap Keuter <jaap.keuter () xs4all nl>]

On 02/07/2011 07:46 PM, Guy Harris wrote:
> On Feb 7, 2011, at 10:34 AM, Stephen Fisher wrote:
>
> > On Mon, Feb 07, 2011 at 07:52:30AM -0500, Matthew Parris wrote:
> >
> > > > Within the abs_time_to_str function, 1900 is added to the tm_year
> > > > parameter, but 1 is not added to the tm_yday.  I'm used to seeing
> > > > the day of the year equal to 1 on January 1st.  Does anyone use 0
> > > > for January 1?
> >
> > I agree that changing it to "1" for Jan 1 makes sense from a human
> > reading the screen perspective.
>
> The "day of year" format code was introduced to support a couple of CCSDS:
>
>         http://en.wikipedia.org/wiki/Consultative_Committee_for_Space_Data_Systems
>
> protocols.  The code it replaced displayed the day-of-year as 0-origin; however, this document:
>
>         http://public.ccsds.org/publications/archive/301x0b2s.pdf
>
> speaks of day-of-year as being 1-origin, at least for the ASCII time code formats.
>
> Unless the NASA guys who contributed the packet-ccsds.c and packet-vcdu.c dissectors would like to argue that, in their 
> dissection, a 0-origin day-of-year works better, in which case we should support both 0-origin and 1-origin display 
> formats, I would suggest switching to a 1-origin display format and see whether we get a complaint from any space data 
> people (in which case we should add a separate 0-origin format).

I say: Let's ask them!

Thanks,
Jaap
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