Re: [bug #21455] date --date "" "+test" fails ONLY WITHIN CERTAIN TIME PERIOD #$%^%

[Jim Meyering]

Paul Eggert <address@hidden> wrote:

> Jim Meyering <address@hidden> writes:
>
>>      * lib/getdate.y (get_date): Once any isspace or TZ= prefix is consumed,
>>      if the remaining date string (to be parsed) is empty, use "0".
>
> Sheesh, and I was trying to look at getdate's guts, which is a big mistake.
> Thanks for the patch; it's much simpler.

I've pushed it.

FYI, I started by comparing ltrace output from these commands
(thanks to Phil for the clock_gettime replacement):

    TZ=Europe/Paris LD_PRELOAD=./clock_gettime.so FAKETIME=1193533200 \
      diff -u <(ltrace ./date -d '' 2>&1) \
              <(ltrace ./date -d 0 2>&1)

That suggested early mktime results differed.
Then debug each and see where/why the mktime inputs diverged:

    TZ=Europe/Paris LD_PRELOAD=./clock_gettime.so FAKETIME=1193533200 \
      gdb --args ./date -d ''

    TZ=Europe/Paris LD_PRELOAD=./clock_gettime.so FAKETIME=1193533200 \
      gdb --args ./date -d 0