From: Joseph Jones <joeyi5216@...>
Date: 2015-12-17T21:06:48-07:00
Subject: [ruby-core:72284] [Ruby trunk - Bug #11595] Time#utc? and Time#gmt? return misleading results based on $TZ

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Joseph Jones liked your message with Boxer. On November 30, 2015 at 06:24=
:39 MST, yasuhiro6194=40gmail.com wrote:Issue =2311595 has been updated b=
y Yasuhiro Nakamura.Assignee set to Akira Tanaka-------------------------=
---------------Bug =2311595: Time=23utc=3F and Time=23gmt=3F return misle=
ading results based on =24TZhttps://bugs.ruby-lang.org/issues/11595=23cha=
nge-55165* Author: David Celis* Status: Open* Priority: Normal* Assignee:=
 Akira Tanaka* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) =5Bx86=
=5F64-darwin14=5D* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN--=
--------------------------------------There is an issue with Time=23utc=3F=
 and its alias, Time=23gmt=3F, that return misleading results based on th=
e value of the TZ environment variable. It seems that the only way for a =
Time instance to return =60true=60 for =60utc=3F=60 is if you explicitly =
call =60=23utc=60 on it before:=7E=7E=7EENV=5B'TZ'=5D =3D 'UTC'=23 =3D> =22=
UTC=22time =3D Time.now=23 =3D> 2015-10-14 19:30:00 +0000time.utc=3F=23 =3D=
> falsetime =3D time.utc=23 =3D> 2015-10-14 19:30:00 UTCtime.utc=3F=23 =3D=
> true=7E=7E=7EThis seems misleading based on the value of =24TZ being =22=
UTC=22. The expected result for calling =60Time.now.utc=3F=60 in this cas=
e would be =60true=60, as would that be expected for time zones that are =
considered links to =22UTC=22 based on the =5Btzdata list=5D(https://en.w=
ikipedia.org/wiki/List=5Fof=5Ftz=5Fdatabase=5Ftime=5Fzones). These includ=
e =22UTC=22, =22GMT=22, =22Etc/UTC=22, =22Etc/GMT=22, =22Universal=22, et=
c.-- https://bugs.ruby-lang.org/     
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<html><body><div>Joseph Jones liked your message with <a href=3D=22http:/=
/bxr.io/PBIqo=22>Boxer</a>.</div><br/><br/><div><div class=3D=22quote=22>=
On November 30, 2015 at 06:24:39 MST, yasuhiro6194=40gmail.com wrote:<br/=
><blockquote type=3D=22cite=22 style=3D=22border-left-style:solid;border-=
width:1px;margin-left:0px;padding-left:10px;=22>Issue =2311595 has been u=
pdated by Yasuhiro Nakamura.<br /><br />Assignee set to Akira Tanaka<br /=
><br />----------------------------------------<br />Bug =2311595: Time=23=
utc=3F and Time=23gmt=3F return misleading results based on =24TZ<br />ht=
tps://bugs.ruby-lang.org/issues/11595=23change-55165<br /><br />* Author:=
 David Celis<br />* Status: Open<br />* Priority: Normal<br />* Assignee:=
 Akira Tanaka<br />* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) =
=5Bx86=5F64-darwin14=5D<br />* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.=
2: UNKNOWN<br />----------------------------------------<br />There is an=
 issue with Time=23utc=3F and its alias, Time=23gmt=3F, that return misle=
ading results based on the value of the TZ environment variable. It seems=
 that the only way for a Time instance to return =60true=60 for =60utc=3F=
=60 is if you explicitly call =60=23utc=60 on it before:<br /><br />=7E=7E=
=7E<br />ENV=5B'TZ'=5D =3D 'UTC'<br />=23 =3D> =22UTC=22<br />time =3D Ti=
me.now<br />=23 =3D> 2015-10-14 19:30:00 +0000<br />time.utc=3F<br />=23 =
=3D> false<br />time =3D time.utc<br />=23 =3D> 2015-10-14 19:30:00 UTC<b=
r />time.utc=3F<br />=23 =3D> true<br />=7E=7E=7E<br /><br />This seems m=
isleading based on the value of =24TZ being =22UTC=22. The expected resul=
t for calling =60Time.now.utc=3F=60 in this case would be =60true=60, as =
would that be expected for time zones that are considered links to =22UTC=
=22 based on the =5Btzdata list=5D(https://en.wikipedia.org/wiki/List=5Fo=
f=5Ftz=5Fdatabase=5Ftime=5Fzones). These include =22UTC=22, =22GMT=22, =22=
Etc/UTC=22, =22Etc/GMT=22, =22Universal=22, etc.<br /><br /><br /><br />-=
- <br />https://bugs.ruby-lang.org/<br /></blockquote></div></div></body>=
</html>
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