Wireshark-dev: Re: [Wireshark-dev] Bug 5653 - Display "Day of Year" for January 1 as 1, not 0
From: Stephen Donnelly <[email protected]>
Date: Tue, 08 Feb 2011 11:59:55 +1300
On 08/02/11 07:46, Guy Harris wrote:
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).
The IRIG 200-04 standard encodes dates as 'day of year' with 1-origin as 
well.
https://wsmrc2vger.wsmr.army.mil/rcc/manuals/200-04/TT-45.pdf
http://en.wikipedia.org/wiki/IRIG_timecode

Stephen.
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