[bug #68526] datestr should support RFC 3339 formats by defaults

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URL:=0A  <https://savannah.gnu.org/bugs/?68526>=0A=0A                 Summa=
ry: datestr should support RFC 3339 formats by defaults=0A                 =
  Group: GNU Octave=0A               Submitter: pot=0A               Submit=
ted: Tue 14 Jul 2026 12:33:51 PM CEST=0A                Category: Octave Fu=
nction=0A                Severity: 3 - Normal=0A                Priority: 5=
 - Normal=0A              Item Group: Feature Request=0A                  S=
tatus: None=0A             Assigned to: None=0A         Originator Name:=0A=
        Originator Email:=0A             Open/Closed: Open=0A         Discu=
ssion Lock: Unlocked=0A                 Release: 10.3.0=0A        Operating=
 System: Any=0A           Fixed Release: None=0A         Planned Release: N=
one=0A=0A=0A    _______________________________________________________=0A=
=0AFollow-up Comments:=0A=0A=0A--------------------------------------------=
-----------=0ADate: Tue 14 Jul 2026 12:33:51 PM CEST By: Francesco Potort=
=C3=AC <pot>=0AFor some reason, datestr does not support by default the RFC=
 3339 format.=0A=0AThis is a request to add a couple default format string =
to parse them.  For=0Aexample, the strings mentioned in the=0A[https://data=
tracker.ietf.org/doc/html/rfc3339#section-5.8 5.8. Examples=0Asection of RF=
C 3339] should be parsed by default:=0A=0A- 2026-07-14T10:22:44Z=0A- 2026-0=
7-14T12:22:44+02:00=0A=0AA fractional part following the seconds should be =
parsed as well by default:=0A=0A- 2026-07-14T10:22:44.765622Z=0A- 2026-07-1=
4T12:22:44.765622+02:00=0A=0A=0A=0A=0A=0A=0A=0A=0A    _____________________=
__________________________________=0A=0AReply to this item at:=0A=0A  <http=
s://savannah.gnu.org/bugs/?68526>=0A=0A____________________________________=
___________=0AMessage sent via Savannah=0Ahttps://savannah.gnu.org/=0A
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