GNU bug report logs - #18328
date: '8pm -0500' is invalid (am/pm problem)

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Package: coreutils; Reported by: 積丹尼 Dan Jacobson <jidanni@HIDDEN>; Keywords: confirmed; dated Mon, 25 Aug 2014 16:02:01 UTC; Maintainer for coreutils is bug-coreutils@HIDDEN.

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Subject: Re: bug#18328: can't say date -d '8pm -0500' though other combos work
To: Jeffery Palm <palmje@HIDDEN>, 18328 <at> debbugs.gnu.org
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On 29/07/2025 06:02, Jeffery Palm wrote:
> I took a look at this bug, and believe I have a patch that will resolve it.
> 
> $ ../src/date --debug -d '2024-01-01 8:00:00PM -0500'
> date: parsed date part: (Y-M-D) 2024-01-01
> date: parsed time part: 08:00:00pm UTC-05
> date: input timezone: parsed date/time string (-05)
> date: using specified time as starting value: '20:00:00'
> date: starting date/time: '(Y-M-D) 2024-01-01 20:00:00 TZ=-05'
> date: '(Y-M-D) 2024-01-01 20:00:00 TZ=-05' = 1704157200 epoch-seconds
> date: timezone: system default
> date: final: 1704157200.000000000 (epoch-seconds)
> date: final: (Y-M-D) 2024-01-02 01:00:00 (UTC)
> date: final: (Y-M-D) 2024-01-01 17:00:00 (UTC-08)
> date: output format: ‘%a %d %b %Y %T %Z’
> Mon 01 Jan 2024 17:00:00 PST
> 
> 
> And I was able to run the coreutils testsuite with no tests failing:
> 
> ============================================================================
> Testsuite summary for GNU coreutils 9.7.174-083f8
> ============================================================================
> # TOTAL: 533
> # PASS:  476
> # SKIP:  57
> # XFAIL: 0
> # FAIL:  0
> # XPASS: 0
> # ERROR: 0
> ============================================================================
> 
> Are there any other tests/changes I should consider for this?
> 
> 
> Below is the patch for the changes I made for this, including a new
> testcase for AM/PM with timezone.
> 
> 
> --- a/lib/parse-datetime.y
> +++ b/lib/parse-datetime.y
> @@ -592,7 +592,7 @@ debug_print_relative_time (char const *item,
> parser_control const *pc)
>   %token tYEAR_UNIT tMONTH_UNIT tHOUR_UNIT tMINUTE_UNIT tSEC_UNIT
>   %token <intval> tDAY_UNIT tDAY_SHIFT
> 
> -%token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN
> +%token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN tMERIDIAN_WITH_ZONE
>   %token <intval> tMONTH tORDINAL tZONE
> 
>   %token <textintval> tSNUMBER tUNUMBER
> @@ -698,6 +698,27 @@ time:
>           set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec);
>           pc->meridian = $6;
>         }
> +  | tUNUMBER tMERIDIAN_WITH_ZONE tSNUMBER o_colon_minutes
> +      {
> +        set_hhmmss (pc, $1.value, 0, 0, 0);
> +        pc->meridian = $2;
> +        pc->zones_seen++;
> +        if (! time_zone_hhmm (pc, $3, $4)) YYABORT;
> +      }
> +  | tUNUMBER ':' tUNUMBER tMERIDIAN_WITH_ZONE tSNUMBER o_colon_minutes
> +      {
> +        set_hhmmss (pc, $1.value, $3.value, 0, 0);
> +        pc->meridian = $4;
> +        pc->zones_seen++;
> +        if (! time_zone_hhmm (pc, $5, $6)) YYABORT;
> +      }
> +  | tUNUMBER ':' tUNUMBER ':' unsigned_seconds tMERIDIAN_WITH_ZONE
> tSNUMBER o_colon_minutes
> +      {
> +        set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec);
> +        pc->meridian = $6;
> +        pc->zones_seen++;
> +        if (! time_zone_hhmm (pc, $7, $8)) YYABORT;
> +      }
>     | iso_8601_time
>     ;
> 
> @@ -1527,14 +1548,19 @@ yylex (union YYSTYPE *lvalp, parser_control *pc)
> 
>             *p = '\0';
>             tp = lookup_word (pc, buff);
> -          if (! tp)
> +          if (tp)
>               {
> -              if (debugging (pc))
> -                dbg_printf (_("error: unknown word '%s'\n"), buff);
> -              return '?';
> +              lvalp->intval = tp->value;
> +              if (tp->type == tMERIDIAN)
> +                {
> +                  char const *p = pc->input;

Better to use a non shadowing name here ^

> +                  while (*p && c_isspace (*p))
> +                    p++;
> +                  if (*p == '-' || *p == '+')
> +                    return tMERIDIAN_WITH_ZONE;
> +                }
> +              return tp->type;
>               }
> -          lvalp->intval = tp->value;
> -          return tp->type;
>           }
> 
>         if (c != '(')
> diff --git a/tests/test-parse-datetime.c b/tests/test-parse-datetime.c
> index 546b383c55..9766ed7a13 100644
> --- a/tests/test-parse-datetime.c
> +++ b/tests/test-parse-datetime.c
> @@ -335,6 +335,15 @@ main (_GL_UNUSED int argc, char **argv)
>     ASSERT (result.tv_sec == result2.tv_sec
>             && result.tv_nsec == result2.tv_nsec);
> 
> +  /* Check that timeone works with AM/PM */
> +  p = "2024-01-01 8PM -08:00";
> +  expected.tv_sec = 1704168000;
> +  expected.tv_nsec = 0;
> +  ASSERT (parse_datetime (&result, p, NULL));
> +  LOG (p, expected, result);
> +  ASSERT (expected.tv_sec == result.tv_sec
> +          && expected.tv_nsec == result.tv_nsec);
> +
> 
>     /* TZ out of range should cause parse_datetime failure */
>     now.tv_sec = SOME_TIMEPOINT + 4711;
Thanks for looking at this.
This changes relative handling unfortunately:

   $ src/date --debug -d '2024-01-01 8:00:00PM -5 days'
   date: parsed date part: (Y-M-D) 2024-01-01
   date: parsed time part: 08:00:00pm UTC-05
   date: parsed relative part: +1 day(s)
   ...
   Wed 03 Jan 2024 01:00:00 GMT

   $ date --debug -d '2024-01-01 8:00:00PM -5 days'
   date: parsed date part: (Y-M-D) 2024-01-01
   date: parsed time part: 08:00:00pm
   date: parsed relative part: -5 day(s)
   ...
   Wed 27 Dec 2023 20:00:00 GMT

Now there is an existing ambiguity here,
where the AM/PM induces the relative interpretation:

   $ date --debug -d '2024-01-01 8:00:00PM -5 days'
   date: parsed date part: (Y-M-D) 2024-01-01
   date: parsed time part: 08:00:00pm
   date: parsed relative part: -5 day(s)

   $ date --debug -d '2024-01-01 8:00:00 -5 days'
   date: parsed date part: (Y-M-D) 2024-01-01
   date: parsed time part: 08:00:00 UTC-05
   date: parsed relative part: +1 day(s)

BTW https://bugs.gnu.org/79078 was a recent bug report
along the same lines of the relative part being unexpectedly
considered as a timezone offset

Now I agree we're already inconsistent in this regard, but I'm sure
folks are relying on the AM/PM inducing a relative interpretation.

If we were trying to make all this more consistent, IMHO
we should change things so that we always interpret +|-<int> <days|minutes|...>
as a relative adjustment, whereas your change does the opposite for the AM/PM case.

cheers,
Padraig




Information forwarded to bug-coreutils@HIDDEN:
bug#18328; Package coreutils. Full text available.

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From: Jeffery Palm <palmje@HIDDEN>
Date: Mon, 28 Jul 2025 22:02:30 -0700
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Subject: Re: bug#18328: can't say date -d '8pm -0500' though other combos work
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I took a look at this bug, and believe I have a patch that will resolve it.

$ ../src/date --debug -d '2024-01-01 8:00:00PM -0500'
date: parsed date part: (Y-M-D) 2024-01-01
date: parsed time part: 08:00:00pm UTC-05
date: input timezone: parsed date/time string (-05)
date: using specified time as starting value: '20:00:00'
date: starting date/time: '(Y-M-D) 2024-01-01 20:00:00 TZ=3D-05'
date: '(Y-M-D) 2024-01-01 20:00:00 TZ=3D-05' =3D 1704157200 epoch-seconds
date: timezone: system default
date: final: 1704157200.000000000 (epoch-seconds)
date: final: (Y-M-D) 2024-01-02 01:00:00 (UTC)
date: final: (Y-M-D) 2024-01-01 17:00:00 (UTC-08)
date: output format: =E2=80=98%a %d %b %Y %T %Z=E2=80=99
Mon 01 Jan 2024 17:00:00 PST


And I was able to run the coreutils testsuite with no tests failing:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
Testsuite summary for GNU coreutils 9.7.174-083f8
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
# TOTAL: 533
# PASS:  476
# SKIP:  57
# XFAIL: 0
# FAIL:  0
# XPASS: 0
# ERROR: 0
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D

Are there any other tests/changes I should consider for this?


Below is the patch for the changes I made for this, including a new
testcase for AM/PM with timezone.


--- a/lib/parse-datetime.y
+++ b/lib/parse-datetime.y
@@ -592,7 +592,7 @@ debug_print_relative_time (char const *item,
parser_control const *pc)
 %token tYEAR_UNIT tMONTH_UNIT tHOUR_UNIT tMINUTE_UNIT tSEC_UNIT
 %token <intval> tDAY_UNIT tDAY_SHIFT

-%token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN
+%token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN tMERIDIAN_WITH_ZONE
 %token <intval> tMONTH tORDINAL tZONE

 %token <textintval> tSNUMBER tUNUMBER
@@ -698,6 +698,27 @@ time:
         set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec);
         pc->meridian =3D $6;
       }
+  | tUNUMBER tMERIDIAN_WITH_ZONE tSNUMBER o_colon_minutes
+      {
+        set_hhmmss (pc, $1.value, 0, 0, 0);
+        pc->meridian =3D $2;
+        pc->zones_seen++;
+        if (! time_zone_hhmm (pc, $3, $4)) YYABORT;
+      }
+  | tUNUMBER ':' tUNUMBER tMERIDIAN_WITH_ZONE tSNUMBER o_colon_minutes
+      {
+        set_hhmmss (pc, $1.value, $3.value, 0, 0);
+        pc->meridian =3D $4;
+        pc->zones_seen++;
+        if (! time_zone_hhmm (pc, $5, $6)) YYABORT;
+      }
+  | tUNUMBER ':' tUNUMBER ':' unsigned_seconds tMERIDIAN_WITH_ZONE
tSNUMBER o_colon_minutes
+      {
+        set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec);
+        pc->meridian =3D $6;
+        pc->zones_seen++;
+        if (! time_zone_hhmm (pc, $7, $8)) YYABORT;
+      }
   | iso_8601_time
   ;

@@ -1527,14 +1548,19 @@ yylex (union YYSTYPE *lvalp, parser_control *pc)

           *p =3D '\0';
           tp =3D lookup_word (pc, buff);
-          if (! tp)
+          if (tp)
             {
-              if (debugging (pc))
-                dbg_printf (_("error: unknown word '%s'\n"), buff);
-              return '?';
+              lvalp->intval =3D tp->value;
+              if (tp->type =3D=3D tMERIDIAN)
+                {
+                  char const *p =3D pc->input;
+                  while (*p && c_isspace (*p))
+                    p++;
+                  if (*p =3D=3D '-' || *p =3D=3D '+')
+                    return tMERIDIAN_WITH_ZONE;
+                }
+              return tp->type;
             }
-          lvalp->intval =3D tp->value;
-          return tp->type;
         }

       if (c !=3D '(')
diff --git a/tests/test-parse-datetime.c b/tests/test-parse-datetime.c
index 546b383c55..9766ed7a13 100644
--- a/tests/test-parse-datetime.c
+++ b/tests/test-parse-datetime.c
@@ -335,6 +335,15 @@ main (_GL_UNUSED int argc, char **argv)
   ASSERT (result.tv_sec =3D=3D result2.tv_sec
           && result.tv_nsec =3D=3D result2.tv_nsec);

+  /* Check that timeone works with AM/PM */
+  p =3D "2024-01-01 8PM -08:00";
+  expected.tv_sec =3D 1704168000;
+  expected.tv_nsec =3D 0;
+  ASSERT (parse_datetime (&result, p, NULL));
+  LOG (p, expected, result);
+  ASSERT (expected.tv_sec =3D=3D result.tv_sec
+          && expected.tv_nsec =3D=3D result.tv_nsec);
+

   /* TZ out of range should cause parse_datetime failure */
   now.tv_sec =3D SOME_TIMEPOINT + 4711;

--0000000000007560d4063b0a51ea
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>I took a look at this bug, and believe=C2=A0I have a =
patch that will resolve it.</div><div><br></div><div>$ ../src/date --debug =
-d &#39;2024-01-01 8:00:00PM -0500&#39;<br>date: parsed date part: (Y-M-D) =
2024-01-01<br>date: parsed time part: 08:00:00pm UTC-05<br>date: input time=
zone: parsed date/time string (-05)<br>date: using specified time as starti=
ng value: &#39;20:00:00&#39;<br>date: starting date/time: &#39;(Y-M-D) 2024=
-01-01 20:00:00 TZ=3D-05&#39;<br>date: &#39;(Y-M-D) 2024-01-01 20:00:00 TZ=
=3D-05&#39; =3D 1704157200 epoch-seconds<br>date: timezone: system default<=
br>date: final: 1704157200.000000000 (epoch-seconds)<br>date: final: (Y-M-D=
) 2024-01-02 01:00:00 (UTC)<br>date: final: (Y-M-D) 2024-01-01 17:00:00 (UT=
C-08)<br>date: output format: =E2=80=98%a %d %b %Y %T %Z=E2=80=99<br>Mon 01=
 Jan 2024 17:00:00 PST</div><div><br></div><div><br></div><div>And I was ab=
le to run the coreutils testsuite with no tests failing:<br><br>=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Te=
stsuite summary for GNU coreutils 9.7.174-083f8<br>=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br># TOTAL: 533<br>#=
 PASS: =C2=A0476<br># SKIP: =C2=A057<br># XFAIL: 0<br># FAIL: =C2=A00<br># =
XPASS: 0<br># ERROR: 0<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div><div><br></div><div>Are there any other=
 tests/changes I should consider for this?</div><div><br></div><div><br></d=
iv><div>Below is the patch for the changes I made for this, including a new=
 testcase=C2=A0for AM/PM with timezone.=C2=A0</div><div><br></div><div><br>=
</div><div>--- a/lib/parse-datetime.y<br>+++ b/lib/parse-datetime.y<br>@@ -=
592,7 +592,7 @@ debug_print_relative_time (char const *item, parser_control=
 const *pc)<br>=C2=A0%token tYEAR_UNIT tMONTH_UNIT tHOUR_UNIT tMINUTE_UNIT =
tSEC_UNIT<br>=C2=A0%token &lt;intval&gt; tDAY_UNIT tDAY_SHIFT<br>=C2=A0<br>=
-%token &lt;intval&gt; tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN<br>+%token &lt;i=
ntval&gt; tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN tMERIDIAN_WITH_ZONE<br>=C2=A0=
%token &lt;intval&gt; tMONTH tORDINAL tZONE<br>=C2=A0<br>=C2=A0%token &lt;t=
extintval&gt; tSNUMBER tUNUMBER<br>@@ -698,6 +698,27 @@ time:<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.t=
v_nsec);<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pc-&gt;meridian =3D $6;<br>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0}<br>+ =C2=A0| tUNUMBER tMERIDIAN_WITH_ZONE tSNU=
MBER o_colon_minutes<br>+ =C2=A0 =C2=A0 =C2=A0{<br>+ =C2=A0 =C2=A0 =C2=A0 =
=C2=A0set_hhmmss (pc, $1.value, 0, 0, 0);<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0p=
c-&gt;meridian =3D $2;<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0pc-&gt;zones_seen++;=
<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0if (! time_zone_hhmm (pc, $3, $4)) YYABORT=
;<br>+ =C2=A0 =C2=A0 =C2=A0}<br>+ =C2=A0| tUNUMBER &#39;:&#39; tUNUMBER tME=
RIDIAN_WITH_ZONE tSNUMBER o_colon_minutes<br>+ =C2=A0 =C2=A0 =C2=A0{<br>+ =
=C2=A0 =C2=A0 =C2=A0 =C2=A0set_hhmmss (pc, $1.value, $3.value, 0, 0);<br>+ =
=C2=A0 =C2=A0 =C2=A0 =C2=A0pc-&gt;meridian =3D $4;<br>+ =C2=A0 =C2=A0 =C2=
=A0 =C2=A0pc-&gt;zones_seen++;<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0if (! time_z=
one_hhmm (pc, $5, $6)) YYABORT;<br>+ =C2=A0 =C2=A0 =C2=A0}<br>+ =C2=A0| tUN=
UMBER &#39;:&#39; tUNUMBER &#39;:&#39; unsigned_seconds tMERIDIAN_WITH_ZONE=
 tSNUMBER o_colon_minutes<br>+ =C2=A0 =C2=A0 =C2=A0{<br>+ =C2=A0 =C2=A0 =C2=
=A0 =C2=A0set_hhmmss (pc, $1.value, $3.value, $5.tv_sec, $5.tv_nsec);<br>+ =
=C2=A0 =C2=A0 =C2=A0 =C2=A0pc-&gt;meridian =3D $6;<br>+ =C2=A0 =C2=A0 =C2=
=A0 =C2=A0pc-&gt;zones_seen++;<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0if (! time_z=
one_hhmm (pc, $7, $8)) YYABORT;<br>+ =C2=A0 =C2=A0 =C2=A0}<br>=C2=A0 =C2=A0=
| iso_8601_time<br>=C2=A0 =C2=A0;<br>=C2=A0<br>@@ -1527,14 +1548,19 @@ yyle=
x (union YYSTYPE *lvalp, parser_control *pc)<br>=C2=A0<br>=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0*p =3D &#39;\0&#39;;<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0tp =3D lookup_word (pc, buff);<br>- =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0if (! tp)<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (tp)<br>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0{<br>- =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0if (debugging (pc))<br>- =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0dbg_printf (_(&quot;error: unknown word &=
#39;%s&#39;\n&quot;), buff);<br>- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0return &#39;?&#39;;<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0lvalp-&gt;intval =3D tp-&gt;value;<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0if (tp-&gt;type =3D=3D tMERIDIAN)<br>+ =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0{<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0char const *p =3D pc-&gt;input;<br>+ =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0while (*p &amp;&=
amp; c_isspace (*p))<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0p++;<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0if (*p =3D=3D &#39;-&#39; || *p =3D=3D &#39;+&#39;)<br>+ =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return=
 tMERIDIAN_WITH_ZONE;<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0}<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return tp-&gt=
;type;<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0}<br>- =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0lvalp-&gt;intval =3D tp-&gt;value;<br>- =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0return tp-&gt;type;<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0}<br>=C2=A0<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0if (c !=3D &#39;(&#39;)<br>=
diff --git a/tests/test-parse-datetime.c b/tests/test-parse-datetime.c<br>i=
ndex 546b383c55..9766ed7a13 100644<br>--- a/tests/test-parse-datetime.c<br>=
+++ b/tests/test-parse-datetime.c<br>@@ -335,6 +335,15 @@ main (_GL_UNUSED =
int argc, char **argv)<br>=C2=A0 =C2=A0ASSERT (result.tv_sec =3D=3D result2=
.tv_sec<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&amp;&amp; result.tv_ns=
ec =3D=3D result2.tv_nsec);<br>=C2=A0<br>+ =C2=A0/* Check that timeone work=
s with AM/PM */<br>+ =C2=A0p =3D &quot;2024-01-01 8PM -08:00&quot;;<br>+ =
=C2=A0expected.tv_sec =3D 1704168000;<br>+ =C2=A0expected.tv_nsec =3D 0;<br=
>+ =C2=A0ASSERT (parse_datetime (&amp;result, p, NULL));<br>+ =C2=A0LOG (p,=
 expected, result);<br>+ =C2=A0ASSERT (expected.tv_sec =3D=3D result.tv_sec=
<br>+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&amp;&amp; expected.tv_nsec =3D=3D =
result.tv_nsec);<br>+<br>=C2=A0<br>=C2=A0 =C2=A0/* TZ out of range should c=
ause parse_datetime failure */<br>=C2=A0 =C2=A0now.tv_sec =3D SOME_TIMEPOIN=
T + 4711;</div></div>

--0000000000007560d4063b0a51ea--




Information forwarded to bug-coreutils@HIDDEN:
bug#18328; Package coreutils. Full text available.

Message received at 18328 <at> debbugs.gnu.org:


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Subject: Re: bug#18328: can't say date -d '8pm -0500' though other combos work
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AG> I hope to get to this bug soon.

Good.




Information forwarded to bug-coreutils@HIDDEN:
bug#18328; Package coreutils. Full text available.
Changed bug title to 'date: '8pm -0500' is invalid (am/pm problem)' from 'can't say date -d '8pm -0500' though other combos work' Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) confirmed. Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#18328: can't say date -d '8pm -0500' though other combos work
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tags 18328 confirmed
retitle 18328 date: '8pm -0500' is invalid (am/pm problem)
stop

(triaging old bugs)

Hello,

On 25/08/14 10:01 AM, 積丹尼 Dan Jacobson wrote:
> $ date -d '8pm -0500'
> date: invalid date ‘8pm -0500’ <--why can't this combo work?

This is indeed a bug (specifically in gnulib's date parsing module,
but easier to track here).

It seems the existence of the "am/pm" string causes the parser
to take a slightly different rule, then reject additional relative
values, unless they have a unit, e.g.:

   $ date --debug -d '8pm +5 days'
   date: parsed time part: 08:00:00pm
   date: parsed relative part: +5 day(s)
   [...]

Contrast it with a different (and confusing) rules when there is
no "am/pm", the relative number is always taken as the time zone, e.g.:

   $ date --debug -d '8:00 +5 days'
   date: parsed time part: 08:00:00 UTC+05
   date: parsed relative part: +1 day(s)
   date: input timezone: parsed date/time string (+05)
   [...]

(from https://bugs.gnu.org/17161#31 )

I hope to get to this bug soon.

-assaf




Information forwarded to bug-coreutils@HIDDEN:
bug#18328; Package coreutils. Full text available.

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Subject: can't say date -d '8pm -0500' though other combos work
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$ date -d '8pm -0500'
date: invalid date =E2=80=988pm -0500=E2=80=99 <--why can't this combo wo=
rk?
$ date -d '20:00 -0500'
=E4=BA=8C  8=E6=9C=88 26 09:00:00 CST 2014
$ date -d 'sun 8pm'
=E6=97=A5  8=E6=9C=88 31 20:00:00 CST 2014
$ date -d '8pm'
=E4=B8=80  8=E6=9C=88 25 20:00:00 CST 2014




Acknowledgement sent to 積丹尼 Dan Jacobson <jidanni@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-coreutils@HIDDEN. Full text available.
Report forwarded to bug-coreutils@HIDDEN:
bug#18328; Package coreutils. Full text available.
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