From @AlexDaniel

Code​:
say Date.new("0000-01-01").truncated-to('week');
say Date.new("0000-01-01").pred();
say Date.new("0000-01-01") - 10000;

Result​:
-001-12-27
-001-12-31
-028-08-15

It seems like ISO 8601 allows negative dates, but it should be -0001-12-31.

“by convention 1 BC is labelled +0000, 2 BC is labeled -0001, and so on.”
(from https://en.wikipedia.org/wiki/ISO_8601)

Similarly,
Code​:
say Date.new("9900-01-01") + 100000

Result​:
10173-10-16

it's OK, but “An expanded year representation [±*Y*YYYY] must have an
agreed-upon number of extra year digits beyond the four-digit minimum, and
it must be prefixed with a + or − sign”.
If I got that right, then it should be +10173-10-16

That being said, I think that the whole thing that is not within 0000-9999
boundary is bound to cause errors, even if Perl6 will ever get it right.
Most naive approaches to parse dates will split by '-' which will break
horribly if the date starts with - sign.

And even Date.new() does not allow to pass anything but yyyy-mm-dd.

From @coke

On Fri Jul 24 13​:01​:20 2015, alex.jakimenko@​gmail.com wrote​:

Code​:
say Date.new("0000-01-01").truncated-to('week');
say Date.new("0000-01-01").pred();
say Date.new("0000-01-01") - 10000;

Result​:
-001-12-27
-001-12-31
-028-08-15

It seems like ISO 8601 allows negative dates, but it should be -0001-12-31.

“by convention 1 BC is labelled +0000, 2 BC is labeled -0001, and so on.”
(from https://en.wikipedia.org/wiki/ISO_8601)

Similarly,
Code​:
say Date.new("9900-01-01") + 100000

Result​:
10173-10-16

it's OK, but “An expanded year representation [±*Y*YYYY] must have an
agreed-upon number of extra year digits beyond the four-digit minimum, and
it must be prefixed with a + or − sign”.
If I got that right, then it should be +10173-10-16

That being said, I think that the whole thing that is not within 0000-9999
boundary is bound to cause errors, even if Perl6 will ever get it right.
Most naive approaches to parse dates will split by '-' which will break
horribly if the date starts with - sign.

And even Date.new() does not allow to pass anything but yyyy-mm-dd.

rakudo has been updated to emit 4 digit years even for the negative years, and is emitting a + on the 5 digit year. passing tests added to t/spec/S32-temporal/Date.t , closing ticket.

--
Will "Coke" Coleda

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

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