bug#54916: closed (4 invalid dates reported by "date")

[GNU bug Tracking System]

Your message dated Wed, 13 Apr 2022 12:19:38 -0700
with message-id <8f847fc7-f985-a0b9-43b5-f96982dea15d@cs.ucla.edu>
and subject line Re: bug#54916: 4 invalid dates reported by "date"
has caused the debbugs.gnu.org bug report #54916,
regarding 4 invalid dates reported by "date"
to be marked as done.

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54916: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=54916
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> Subject: 
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> 4 invalid dates reported by "date"
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> Date: 
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> Wed, 13 Apr 2022 16:30:04 +0300
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> User-agent: 
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> Inbox.lv Webmail
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> Hello software maintainers.
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> While using a script that relies upon the "date" utility to reconstruct historical calendar dates, I came across errors when submitting only the first day of the month April for the years 1981, 1982, 1982 and 1984. I assume no April fools is intended here for public domain software!
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> Here is a transcript of test dates that supposedly are not a radical departure from mostly free human readable date strings I use in the bash shell:
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> On a Lenovo x250:
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> ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1980-04-01"
> 323384400
> ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1981-04-01"
> date: invalid date ‘1981-04-01’
> ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1982-04-01"
> date: invalid date ‘1982-04-01’
> ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1983-04-01"
> date: invalid date ‘1983-04-01’
> ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1984-04-01"
> date: invalid date ‘1984-04-01’
> ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1984-04-02"
> 449697600
> ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1985-04-01"
> 481147200
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> rc  linux-image-unsigned-4.4.0-194-generic 4.4.0-194.226+8.0trisquel3                     amd64        Linux-libre kernel image for version 4.4.0
> -------------------
> I also observed the same results as described above on all other systems and other laptops in my possession:
> acer: 4.15.0-166.174+9.0trisquel9
> asus: 4.4.0-197.229_8.0trisquel3
> asus: 5.4.0-91.102+10.0trisquel9
> ----------------------
> Hopefully my usage of the date utility is not in some way abnormal.
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> Regards.
>
> Martins
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> --- Begin Message ---
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> Subject: 
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> Re: bug#54916: 4 invalid dates reported by "date"
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> Date: 
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> Wed, 13 Apr 2022 12:19:38 -0700
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> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0
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> On 4/13/22 06:30, Martins Ozolins via GNU coreutils Bug Reports wrote:
> >     ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1981-04-01"
> >     date: invalid date ‘1981-04-01’
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> This is because your invocation is equivalent to:
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> date +%s --date="1981-04-01 00:00:00"
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> and there was no midnight at that date in Latvia.
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