From: Heesob Park Date: 2012-02-28T16:16:49+09:00 Subject: [ruby-core:42997] [ruby-trunk - Bug #6100][Open] Unexpected value of Time#iso8601 with floating point argument. Issue #6100 has been reported by Heesob Park. ---------------------------------------- Bug #6100: Unexpected value of Time#iso8601 with floating point argument. https://bugs.ruby-lang.org/issues/6100 Author: Heesob Park Status: Open Priority: Normal Assignee: Category: Target version: ruby -v: ruby 2.0.0dev (2012-02-21 trunk 34712) [i386-mswin32_100] I found Time#iso8601 returns unexpected value in case of floating point argument. C:\>irb irb(main):001:0> require 'time' => true irb(main):002:0> a = Time.now => 2012-02-28 16:12:18 +0900 irb(main):003:0> a.iso8601(10) => "2012-02-28T16:12:18.3203750000+09:00" irb(main):004:0> a.iso8601(1) => "2012-02-28T16:12:18.3+09:00" irb(main):005:0> a.iso8601(1.5) => "2012-02-28T16:12:18.10+09:00" irb(main):006:0> a.iso8601(1.6) => "2012-02-28T16:12:18.12+09:00" irb(main):007:0> a.iso8601(1.7) => "2012-02-28T16:12:18.16+09:00" irb(main):008:0> a.iso8601(1.8) => "2012-02-28T16:12:18.20+09:00" irb(main):009:0> a.iso8601(2) => "2012-02-28T16:12:18.32+09:00" irb(main):010:0> a.iso8601(2.1) => "2012-02-28T16:12:18.40+09:00" By the way, In ruby 1.8.7, it works as expected. $ irb irb(main):001:0> require 'time' => true irb(main):002:0> a = Time.now => Tue Feb 28 16:14:07 +0900 2012 irb(main):003:0> a.iso8601(10) => "2012-02-28T16:14:07.3405450000+09:00" irb(main):004:0> a.iso8601(1) => "2012-02-28T16:14:07.3+09:00" irb(main):005:0> a.iso8601(1.1) => "2012-02-28T16:14:07.3+09:00" irb(main):006:0> a.iso8601(1.5) => "2012-02-28T16:14:07.3+09:00" irb(main):007:0> a.iso8601(1.9) => "2012-02-28T16:14:07.3+09:00" irb(main):008:0> a.iso8601(2) => "2012-02-28T16:14:07.34+09:00" irb(main):010:0> a.iso8601(2.1) => "2012-02-28T16:14:07.34+09:00" -- http://bugs.ruby-lang.org/