From: "NARUSE, Yui" <naruse@...>
Date: 2010-04-05T13:50:28+09:00
Subject: [ruby-core:29261] Re: [Bug #3085] Time dumping/loading using 	Psych

2010/4/5 Tanaka Akira <akr@fsij.org>:
> 2010/4/5 Aaron Patterson <aaron@tenderlovemaking.com>:
>>
>> How should this problem be fixed? �If a time object when dumped as YAML
>> does not use the YAML time format, that would be surprising to me. �Is
>> my assumption wrong? �I'd like to leave it the way it works now.
>
> If the fractional seconds are representable in the decimal system,
> it should be representable in the YAML time format.
>
> For example, Ruby obtains the current time using clock_gettime if available.
> clock_gettime returns struct timespec which has nano-second resolution.
> It needs 9 digits to preserve the information.
> But psych dumps only 6 digits.
> This is why Psych.load(Psych.dump(Time.now)) doesn't round trip.
>
> FreeBSD has bintime which is 2**(-64) second resolution.
> It is also representable in the decimal system.
> (It may need 64 digits, though.)
> Ruby generates such time in Socket::AncillaryData#timestamp.

YAML's timestamp (ISO 8601)'s fraction can have non-limited digits.
http://yaml.org/type/timestamp.html

-- 
NARUSE, Yui
naruse@airemix.jp