From zefram@fysh.org

DateTime.Str is documented to produce output in ISO 8601 format by
default, but the formatting of some year numbers outside the range 0 to
9999 inclusive is faulty. The expanded representation that is required
is governed by ISO 8601​:2004 clause 4.1.2.4. Firstly, for year numbers

9999, the use of a leading sign is mandatory with year numbers of five
or more digits, but the sign is being omitted​:

DateTime.new(​:year(10000)).Str
10000-01-01T00​:00​:00Z
DateTime.new(​:year(54321)).Str
54321-01-01T00​:00​:00Z
DateTime.new(​:year(654321)).Str
654321-01-01T00​:00​:00Z

Secondly, for year numbers -999 to -1 inclusive, it is mandatory to use
at least four digits, but only three are being used​:

DateTime.new(​:year(-999)).Str
-999-01-01T00​:00​:00Z
DateTime.new(​:year(-1)).Str
-001-01-01T00​:00​:00Z

The representation is correct for years <-999 and years 0 to 9999
inclusive.

-zefram

From @lizmat

On 24 Dec 2015, at 00​:08, Zefram (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by Zefram
# Please include the string​: [perl #​127007]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=127007 >

DateTime.Str is documented to produce output in ISO 8601 format by
default, but the formatting of some year numbers outside the range 0 to
9999 inclusive is faulty. The expanded representation that is required
is governed by ISO 8601​:2004 clause 4.1.2.4. Firstly, for year numbers

9999, the use of a leading sign is mandatory with year numbers of five
or more digits, but the sign is being omitted​:

DateTime.new(​:year(10000)).Str
10000-01-01T00​:00​:00Z
DateTime.new(​:year(54321)).Str
54321-01-01T00​:00​:00Z
DateTime.new(​:year(654321)).Str
654321-01-01T00​:00​:00Z

Secondly, for year numbers -999 to -1 inclusive, it is mandatory to use
at least four digits, but only three are being used​:

DateTime.new(​:year(-999)).Str
-999-01-01T00​:00​:00Z
DateTime.new(​:year(-1)).Str
-001-01-01T00​:00​:00Z

The representation is correct for years <-999 and years 0 to 9999
inclusive.

Fixed with 895546990f6001a5999ef , tests added with 0fa2c59924a35bb41e792

Can be closed.

Liz

The RT System itself - Status changed from 'new' to 'open'

From @usev6

On Wed Dec 23 15​:52​:29 2015, elizabeth wrote​:

Fixed with 895546990f6001a5999ef , tests added with
0fa2c59924a35bb41e792

Can be closed.

Great! I'm closing the ticket as 'resolved'.

@usev6 - Status changed from 'open' to 'resolved'