ruby-on-rails - Rails 不会从夏令时过渡出来

Question

rails 版本:6.0.3.4 ruby 版本:2.6.6tzinfo gem 版本:1.2.7虽然日光切换应该在 11 月 1 日结束，但我的 Rails 应用程序不知何故仍在使用 PDT(-7:00)，当我预计它在 11 月 4 日处于 PST(-08:00)时。

> Time.now
2020-11-05 02:45:15 +0000
> Time.zone.now
Wed, 04 Nov 2020 19:45:23 PDT -07:00

以下是我目前所知道的:

操作系统 /etc/localtime设置为更正 GMT

config.time_zone设置为 Pacific Time (US & Canada)

config.active_record.default_timezone未设置

Postgres 设置为 UTC

有谁知道这是怎么回事？我注意到 Time.zone.tzinfo.current_period有点奇怪(设置为 2007)但不确定它是否相关:

> Time.zone.tzinfo.current_period
#<TZInfo::TimezonePeriod: #<TZInfo::TimezoneTransitionDefinition: #<TZInfo::TimeOrDateTime: 1173607200>,#<TZInfo::TimezoneOffset: -28800,3600,PDT>>,nil>
> Time.zone.tzinfo.current_period.local_start
Sun, 11 Mar 2007 03:00:00 +0000
> Time.zone.tzinfo.current_period.local_end
nil

更新:这里是 zdump 信息，所以看起来操作系统有正确的信息:

> zdump -v /usr/share/zoneinfo/America/Los_Angeles | grep 2020
/usr/share/zoneinfo/America/Los_Angeles  Sun Mar  8 09:59:59 2020 UT = Sun Mar  8 01:59:59 2020 PST isdst=0 gmtoff=-28800
/usr/share/zoneinfo/America/Los_Angeles  Sun Mar  8 10:00:00 2020 UT = Sun Mar  8 03:00:00 2020 PDT isdst=1 gmtoff=-25200
/usr/share/zoneinfo/America/Los_Angeles  Sun Nov  1 08:59:59 2020 UT = Sun Nov  1 01:59:59 2020 PDT isdst=1 gmtoff=-25200
/usr/share/zoneinfo/America/Los_Angeles  Sun Nov  1 09:00:00 2020 UT = Sun Nov  1 01:00:00 2020 PST isdst=0 gmtoff=-28800

更多 TZInfo :

> TZInfo::DataSource.get
#<TZInfo::ZoneinfoDataSource: /usr/share/zoneinfo>

Answer 1

这是由于 tzinfo gem 与新的 tz 版本不兼容:https://github.com/tzinfo/tzinfo/issues/120

The 2020b version of the 'zic' time zone compiler has changed to output zoneinfo files using a new 'slim' format by default. The slim format requires users of the zoneinfo files to interpret rules instead of just reading a list of transitions.

TZInfo currently only supports reading the transitions and will require modification to use the rules. Consequently, it'll produce the wrong offset at some point after the final transition in the file.

问题始于 2020b格式。 ruby:2.6-alpine安装 2020c默认情况下，当您运行时 apk add tzdata

> docker run -it alpine:3.12
/ > apk add tzdata && apk list | grep tzdata
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
(1/1) Installing tzdata (2020c-r0)
Executing busybox-1.31.1-r19.trigger
OK: 9 MiB in 15 packages
tzdata-2020c-r0 x86_64 {tzdata} (Public-Domain) [installed]
tzdata-doc-2020c-r0 x86_64 {tzdata} (Public-Domain)