[AstroPy] astropy fits time header

[Bob Garwood]

This is the FITS Y2K agreement approved by the IAU-FWG prior to 2000.  
It shows that the old style 'DD/MM/YY' remains an acceptable form for 
dates prior to 2000.

http://fits.gsfc.nasa.gov/year2000.html

According to the FITS standard document (also at GSFC, see the link in 
Peter's e-mail) that form should not be used in FITS files produced 
after 1 January 2000.  But it's still valid FITS. Because "once fits, 
always fits".

Bob

On 09/13/2016 11:33 AM, Demitri Muna wrote:
> Hi Peter,
>
> On Sep 13, 2016, at 11:20 AM, Peter Teuben <teuben at astro.umd.edu 
> <mailto:teuben at astro.umd.edu>> wrote:
>
>> Re: "It's unfortunate that it says that a string like '14/10/96' is 
>> acceptable."
>>
>> that's the "once fits, always fits" rule. It's not unfortunate, it's 
>> fortunate!! (if not a bit annoying for code writers)
>> the fits verify better not fail on this one.  If the DATE is of this 
>> old style format, you might also see a TIME keyword.
>
> Can you clarify this? Are you saying that the "old style" was part of 
> the specification and is no longer? That seems unlikely - FITS is 
> the Katamari Damacy of file formats. fitsverify is written by Bill 
> Pence (as in "ciftsio Bill Pence"), so I find it unlikely that it 
> flags something as invalid that is valid. Can you point to a 
> (non-STScI) source that says that '14/10/96' is an acceptable format?
>
> Cheers,
> Demitri
>
> _________________________________________
> Demitri Muna
> http://muna.com
>
> Department of Astronomy
> Le Ohio State University
>
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