Hi all,

The doc for Regexp::Common::time ISO8601 datetimes states:

• The date separator character may be a hyphen, slash (/), period, or empty string (omitted). The two date separators must match.
• The time separator character may be a colon, a period, a space, or empty string (omitted). The two time separators must match.

However the standard for an ISO8601 datetime appears to additionally require that if a separator is used for the date or the time, a separator must also be used for the other component. I cannot find a spec that states this, but read on ...

Demonstrated with DateTime::Format::ISO8601 :

$ perl -Mstrict -MRegexp::Common=time -MDateTime::Format::ISO8601 -wE 
+'
my $str = "2018-03-01T110601Z";
say "DateTime::Format: ", eval { my $dt = DateTime::Format::ISO8601->p
+arse_datetime($str) } ? "valid" : "not valid: $@";
say "Regexp::Common: ", $str =~ /$RE{time}{iso}/ ? "valid" : "not vali
+d";
'

DateTime::Format: not valid: Invalid date format: 2018-03-01T110601Z a
+t -e line 3.
    eval {...} called at -e line 3

Regexp::Common: valid
[download]

Control:

$ perl -Mstrict -MRegexp::Common=time -MDateTime::Format::ISO8601 -wE 
+'
my $str = "2018-03-01T11:06:01Z";
say "DateTime::Format: ", eval { my $dt = DateTime::Format::ISO8601->p
+arse_datetime($str) } ? "valid" : "not valid: $@";
say "Regexp::Common: ", $str =~ /$RE{time}{iso}/ ? "valid" : "not vali
+d";
'

DateTime::Format: valid
Regexp::Common: valid
[download]

Which is right?

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