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Subject: bug#72023: feature request for date(1): strptime-style format string when you don't want date to guess
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Thread-Topic: feature request for date(1): strptime-style format string when
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Date: Tue, 9 Jul 2024 20:29:44 +0000
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I suspect this has been requested many times over the decades but I haven=
't found anything in the issue tracker so...
The date command lets you choose my output format, but for input it tries=
=20to figure it out without hints.  For interactive use, this is great.
For usage in scripts, this is less than ideal, because that means you nee=
d to understand the heuristics to have confidence that your script will d=
o what you want.
For instance, this page:
https://www.gnu.org/software/coreutils/manual/html_node/Pure-numbers-in-d=
ate-strings.html
says that "If the decimal number is of the form yyyymmdd [...] yyyy is re=
ad as the year"
I stared at that sentence for a bit in confusion, thinking to myself "but=
=20how could it possibly KNOW that the number is of the form yyyymmdd??"
I finally realized that what it's really saying is that "if the number is=
=20exactly 8 digits long, we ASSUME that the first four digits are the ye=
ar".
Thus, if you have an 8-digit number that you want to interpret differentl=
y then you should massage it before passing it to date.

As it happens, I have an 8 digit number, and indeed the built-in assumpti=
ons happen to be a perfect fit for me.
But I still don't like to rely on them if I don't have to, and would rath=
er just tell it what I already know, instead of forcing date(1) to re-der=
ive it.

Thoughts?
Mark.

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<p class=3D"MsoNormal">I suspect this has been requested many times over =
the decades but I haven&#8217;t found anything in the issue tracker so&#8=
230;<o:p></o:p></p>
<p class=3D"MsoNormal">The date command lets you choose my output format,=
=20but for input it tries to figure it out without hints.&nbsp; For inter=
active use, this is great.<o:p></o:p></p>
<p class=3D"MsoNormal">For usage in scripts, this is less than ideal, bec=
ause that means you need to understand the heuristics to have confidence =
that your script will do what you want.<o:p></o:p></p>
<p class=3D"MsoNormal">For instance, this page:<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://www.gnu.org/software/coreutils/=
manual/html_node/Pure-numbers-in-date-strings.html">https://www.gnu.org/s=
oftware/coreutils/manual/html_node/Pure-numbers-in-date-strings.html</a><=
o:p></o:p></p>
<p class=3D"MsoNormal">says that &#8220;If the decimal number is of the f=
orm yyyymmdd [&#8230;] yyyy is read as the year&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal">I stared at that sentence for a bit in confusion, =
thinking to myself &#8220;but how could it possibly KNOW that the number =
is of the form yyyymmdd??&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal">I finally realized that what it&#8217;s really say=
ing is that &#8220;if the number is exactly 8 digits long, we ASSUME that=
=20the first four digits are the year&#8221;.<o:p></o:p></p>
<p class=3D"MsoNormal">Thus, if you have an 8-digit number that you want =
to interpret differently then you should massage it before passing it to =
date.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As it happens, I have an 8 digit number, and indee=
d the built-in assumptions happen to be a perfect fit for me.<o:p></o:p><=
/p>
<p class=3D"MsoNormal">But I still don&#8217;t like to rely on them if I =
don&#8217;t have to, and would rather just tell it what I already know, i=
nstead of forcing date(1) to re-derive it.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thoughts?<o:p></o:p></p>
<p class=3D"MsoNormal">Mark.<o:p></o:p></p>
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Subject: bug#72023: Acknowledgement (feature request for date(1):
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I'm dubious. I've never had much luck with strptime, as in practice it 
has its own glitches that are even worse than what 'date' currently 
uses. For example, it's dicey in non-C locales, and it mishandles time 
zones and daylight saving transitions even in the C locale.

That being said, if someone can write the code and documentation and 
test cases it might be a good thing to have - particularly if some other 
'date' implementation is already doing that sort of thing and people 
have had good experience with it.

Last modified: Wed, 10 Jul 2024 10:45:02 UTC

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