[Sis-ams] Time Tag - CCSDS Time

[Donahue, Pat]

no advantage or disadvantage
 
Since Scott was already using the 1958 epoch in his implementation, I
was going to use it also so my stuff would work against his.  And for
the same reason, I think we all should use the same epoch.
 

Patrick Donahue
(256) 544-5943 office
(256) 721-0726 home
(256) 682-9753 cell 

 


________________________________

	From: Ray, Timothy J. (GSFC-583.0)
[mailto:timothy.j.ray at nasa.gov] 
	Sent: Thursday, August 21, 2008 2:21 PM
	To: Donahue, Pat
	Cc: sis-ams at mailman.ccsds.org
	Subject: RE: [Sis-ams] Time Tag - CCSDS Time
	
	

	Sounds good Pat.

	 

	Just out of curiosity, is there some advantage to using the
older epoch?

	 

	Tim

	 

	 

	 

	
________________________________


	From: sis-ams-bounces at mailman.ccsds.org
[mailto:sis-ams-bounces at mailman.ccsds.org] On Behalf Of Donahue, Pat
	Sent: Wednesday, August 20, 2008 12:35 PM
	To: sis-ams at mailman.ccsds.org
	Subject: [Sis-ams] Time Tag - CCSDS Time

	 

	For interoperability sake, just like we have agreed to an
"Unsegmented" CCSDS format, I suggest that we also agree to all use the
1958 epoch as our basis, and 4 bytes of course time (since you need that
many bytes to properly contain the number of seconds since Jan 1, 1958).

	 

	By the way, if you are working with the Jan 1, 1970 epoch in
Unix just add 378691200 and you will have the number of seconds since
Jan 1, 1958.  Correct me if I am wrong.

	 

	Patrick Donahue
	(256) 544-5943 office
	(256) 721-0726 home
	(256) 682-9753 cell

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