Where do I report this DateTime bug?

Rails
1

I have isolated what appears to be a bug in the Rails extensions to
DateTime, but I don’t know where to report it.

The punch line is that this code:

TestRecord.create!(:f_datetime => (expected = DateTime.jd(2000000)))
found = TestRecord.first.f_datetime

puts("expected == found => #{expected == found}")
puts("expected = #{expected.to_formatted_s(:rfc822)}")
puts("found =    #{found.to_formatted_s(:rfc822)}")

generates this response:

expected == found => true
expected = Wed, 14 Sep 0763 00:00:00 +0000
found =    Sat, 14 Sep 0763 00:00:00 +0000

So. The dates are equal, but was that day a Wednesday or a Saturday?

PS: I’m using postgresql with Ruby 1.93 and Rails 3.2.1

2

On 21 June 2012 17:36, Fearless F. [email protected] wrote:

puts(“expected = #{expected.to_formatted_s(:rfc822)}”)
puts(“found = #{found.to_formatted_s(:rfc822)}”)

generates this response:

expected == found => true
expected = Wed, 14 Sep 0763 00:00:00 +0000
found = Sat, 14 Sep 0763 00:00:00 +0000

So. The dates are equal, but was that day a Wednesday or a Saturday?

Can you post the contents of schema.rb section for the table.
Also it would be interesting to put in some inspect debug for expected
and found.

Colin

3

Can you post the contents of schema.rb section for the table.
Also it would be interesting to put in some inspect debug for expected
and found.

Colin:

Done. See Demonstration of bug in DateTime#to_formatted_s(:rfc822) · GitHub for code and results.

As for “inspect debug for expected and found”, I assume you mean like
this:

puts("expected = #{expected.to_formatted_s(:rfc822)}

(#{expected.inspect})")
puts(“found = #{found.to_formatted_s(:rfc822)}
(#{found.inspect})”)

=>

expected = Wed, 14 Sep 0763 00:00:00 +0000 (Wed, 14 Sep 0763 00:00:00
+0000)
found = Sat, 14 Sep 0763 00:00:00 +0000 (Sat, 14 Sep 0763 00:00:00
UTC +00:00)

HTH.

  • ff
4

I’ve created:

two DateTime objects are == but print differently · Issue #6814 · rails/rails · GitHub

… which seems like the correct place to report this. I’m sure I’ll
hear from the rails admin team soon enough if that’s not the right
place.

  • ff
5

On 21 June 2012 18:05, Fearless F. [email protected] wrote:

puts(“expected = #{expected.to_formatted_s(:rfc822)}
(#{expected.inspect})”)
puts(“found = #{found.to_formatted_s(:rfc822)}
(#{found.inspect})”)

What is the class of found?

Colin

6

Colin L. wrote in post #1065800:

What is the class of found?

I updated the above mentioned gist. ‘expected’ is a DateTme, ‘found’ is
ActiveSupport::TimeWithZone.

Also I don’t think you have told us which versions of ruby and rails
you are using.

Apologies, this was buried at the end of the OP:

PS: I’m using postgresql with Ruby 1.93 and Rails 3.2.1

But this is all now moot: I posted this as a Rails issue:

two DateTime objects are == but print differently · Issue #6814 · rails/rails · GitHub

where @pixeltrix patiently educated me on the anomalies of ancient
calendar systems. The best line was “[calendar reforms] can lead to
oddities like William Shakespeare and Miguel de Cervantes dying on the
same date but 10 days apart.” He also suggests using #gregorian to
adjust the datetime before converting to time, e.g:

>> DateTime.jd(2000000).gregorian
=> Wed, 18 Sep 0763 00:00:00 +0000

So: not a bug. Just a reality of calendar reforms.

7

On 22 June 2012 08:23, Colin L. [email protected] wrote:

this:

puts(“expected = #{expected.to_formatted_s(:rfc822)}
(#{expected.inspect})”)
puts(“found = #{found.to_formatted_s(:rfc822)}
(#{found.inspect})”)

What is the class of found?

Also I don’t think you have told us which versions of ruby and rails
you are using.

Colin