bug#54916: 4 invalid dates reported by "date"

2022-04-13 Thread Paul Eggert 

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’


This is because your invocation is equivalent to:

date +%s --date="1981-04-01 00:00:00"

and there was no midnight at that date in Latvia.

bug#54916: 4 invalid dates reported by "date"

2022-04-13 Thread Martins Ozolins 
   Hello software maintainers.
   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!
   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:
   On a Lenovo x250:
   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
   rc  linux-image-unsigned-4.4.0-194-generic
   4.4.0-194.226+8.0trisquel3 amd64Linux-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.
   Regards.
   Martins