From: akr@fsij.org
To: ruby-core@ruby-lang.org
Subject: [ruby-core:71592] [Ruby trunk - Bug #11716] [Rejected] Truncation error in Time xmlschema with fraction_digits.
Date: Thu, 19 Nov 2015 22:55:20 +0000 [thread overview]
Message-ID: <redmine.journal-54975.20151119225517.e9076d21b6bdba16@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-11716.20151119200201@ruby-lang.org
Issue #11716 has been updated by Akira Tanaka.
Status changed from Open to Rejected
It's because 1447961542.26 is actually 1447961542.2599999904632568359375.
```
% ruby -e 'p "%.1000g" % 1447961542.26'
"1447961542.2599999904632568359375"
```
If 1447961542.26 is exactly given as rational, xmlschema(2) generates ".26" as the fractional part.
```
% ruby -rtime -e 'p Time.at(1447961542.26).xmlschema(2)'
"2015-11-20T04:32:22.25+09:00"
% ruby -rtime -e 'p Time.at(1447961542.26r).xmlschema(2)'
"2015-11-20T04:32:22.26+09:00"
```
----------------------------------------
Bug #11716: Truncation error in Time xmlschema with fraction_digits.
https://bugs.ruby-lang.org/issues/11716#change-54975
* Author: Nick R
* Status: Rejected
* Priority: Normal
* Assignee:
* ruby -v: ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
It looks like xmlschema with the fraction_digits parameter truncates the fractional second part.
Sometimes it truncates too much.
ex : 1447961542.26 with 2 fraction digits gives 1447961542.25 instead of 1447961542.26
Could be due to floating point representation. But tests seem to indicate otherwise.
`$ irb
$ require 'time'
=> true
$ Time.at(1447961542.26).xmlschema(2)
=> "2015-11-19T11:32:22.25-08:00"
$ Time.at(1447961542.269).xmlschema(2)
=> "2015-11-19T11:32:22.26-08:00"
$ Time.at(1447961542.259).xmlschema(2)
=> "2015-11-19T11:32:22.25-08:00"
$ Time.at(1447961542.25).xmlschema(2)
=> "2015-11-19T11:32:22.25-08:00"
$ 1447961542.26*100.floor
=> 144796154226.0
`
--
https://bugs.ruby-lang.org/
prev parent reply other threads:[~2015-11-19 22:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-11716.20151119200201@ruby-lang.org>
2015-11-19 20:02 ` [ruby-core:71589] [Ruby trunk - Bug #11716] [Open] Truncation error in Time xmlschema with fraction_digits niroyb
2015-11-19 22:55 ` akr [this message]
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