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

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Follow-up Comment #1, bug #68526 (group octave):=0A=0ARelated:  patch #9964=
=0A=0A=0A    _______________________________________________________=0A=0AR=
eply to this item at:=0A=0A  <https://savannah.gnu.org/bugs/?68526>=0A=0A__=
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