[aprssig] Timestamp Questions

[Guido Trentalancia]

On Thu, 2011-06-09 at 07:40 -0400, Lynn W. Deffenbaugh (Mr) wrote:
> If you're going to write a new APRS client, you need to get a copy of
> aprs101.pdf and read it, study it, read it, and study it some more. 

And when you finished studying the protocol specification, you can
always look at some examples in the live APRS stream:

http://aprs.fi/?c=raw&call=

Guido

>  Most of your basic questions will be answered therein, like the fact
> that messages have NO timestamp!  Also, on page 22 (32 in acrobat) it
> says:
> 
> > Hours/Minutes/Seconds (HMS) format is a fixed 7-character field,
> > consisting of a 6-digit time in hours, minutes and seconds, followed
> > by the h
> > time-indicator character. For example:
> > 
> > 234517h is 23 hours 45 minutes and 17 seconds zulu.
> > 
> > Note: This format may not be used in Status Reports.
> 
> Note the ZULU mentioned on the next to last line.
> 
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
> 
> 
> On 6/8/2011 2:17 AM, Rud Merriam wrote: 
> > Is an 'h' format timestamp assumed to be local or UTC?
> > 
> > Does APRS-IS send out 'h' timestamps as local, UTC, or as received
> > from source?
> > 
> > If I am doing a HUD display for messages (or other stuff in the
> > future) do I care about the timestamp?  
> > -- 
> > 
> > - 73 - 
> > Rud Merriam K5RUD
> > Emergency Coordinator
> > Montgomery County ARES® 
> > Mystic Lake Software