Issue #10733 has been updated by Maarten Claes. After some experimentation it looks like this has something do with the fact that `DateTime#httpdate` returns an `US-ASCII` encoded string. ``` require 'time' from_httpdate = DateTime.now.httpdate as_string = "Mon, 12 Jan 2015 12:09:19 GMT" puts from_httpdate.encoding # => US-ASCII puts Time.httpdate(from_httpdate) # Works puts Time.httpdate(as_string) # Works begin puts(Time.httpdate(from_httpdate)) # => ArgumentError rescue => e p e end puts from_httpdate.encode!(Encoding.find('UTF-8')) begin puts Time.httpdate(from_httpdate) # Works rescue => e p e end ``` ---------------------------------------- Bug #10733: Time.httpdate raises ArgumentError when DateTime.now.httpdate is provided as input https://bugs.ruby-lang.org/issues/10733#change-50965 * Author: Maarten Claes * Status: Open * Priority: Normal * Assignee: * ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14] * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN ---------------------------------------- An irb session demonstrating the bug: ``` irb(main):001:0> require 'time' => true irb(main):002:0> Time.httpdate("Mon, 12 Jan 2015 12:04:15 GMT") => 2015-01-12 12:04:15 UTC irb(main):003:0> DateTime.now.httpdate.to_s => "Mon, 12 Jan 2015 12:04:56 GMT" irb(main):004:0> Time.httpdate(DateTime.now.httpdate.to_s) ArgumentError: not RFC 2616 compliant date: "Mon, 12 Jan 2015 12:05:08 GMT" from /Users/mcls/.rbenv/versions/2.2.0/lib/ruby/2.2.0/time.rb:544:in `httpdate' from (irb):4 from /Users/mcls/.rbenv/versions/2.2.0/bin/irb:11:in `<main>' ``` To reproduce: ``` require 'time' Time.httpdate("Mon, 12 Jan 2015 12:04:15 GMT") # works Time.httpdate(DateTime.now.httpdate.to_s) # => ArgumentError ``` It seems that this only occurs on 2.2.0. (Tested on 2.1.5 and it works fine) -- https://bugs.ruby-lang.org/