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Re: Full Julian date in date command formatting options?

From: Eric Blake
Subject: Re: Full Julian date in date command formatting options?
Date: Fri, 11 Oct 2013 13:36:11 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0

On 10/11/2013 01:18 PM, Eric Blake wrote:
> On 10/11/2013 11:56 AM, Reed Underwood wrote:
>> I wonder if it would be alright to implement a
>> full Julian date in the date command's format options
>> (maybe a %J?). It could be really useful in shell
>> scripts, etc.
> Can you give an example of what you mean be a full Julian date? suggests:

For example, The Julian Date for 00:30:00.0 January 1, 2013 is

If the astronomical term is what you want, then maybe you really do have
a format that cannot be expressed in any existing notation, and maybe it
really is worth burning a % notation.  But how common is the
Astronomical Julian Date in shell programming?

On the other hand, that wikipedia page also suggests:

Outside of an astronomical or historical context, if a given "Julian
date" is "40", this most likely means the fortieth day of a given
Gregorian year, namely February 9.

and _that_ description sounds like what 'date +%j' already gives you.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library

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