[ruby-core:74433] [Ruby trunk Bug#12190] DateTime.strptime and Time.strptime does not have compatibility in terms of parsing timezone

Issue #12190 has been updated by Naotoshi Seo.


It seems both DateTime.strptime and Time.strptime uses Date._strptime internally https://github.com/ruby/ruby/blob/087a393fa56c4dcf247588d2fb018c4bd46003cb/lib/time.rb#L428, but Time.strptime is not utilizing :offset information given by it. That was why. 

I also found that Time.parse also did not utilize the timezone information.

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Bug #12190: DateTime.strptime and Time.strptime does not have compatibility in terms of parsing timezone
https://bugs.ruby-lang.org/issues/12190#change-57552

* Author: Naotoshi Seo
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin13]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
For CET, only DateTime.strptime successfully parsed timezone

```
irb(main):003:0> DateTime.strptime('2015-11-12 CET', '%Y-%m-%d %Z')
=> #<DateTime: 2015-11-12T00:00:00+01:00 ((2457338j,82800s,0n),+3600s,2299161j)>
irb(main):004:0> Time.strptime('2015-11-12 CET', '%Y-%m-%d %Z')
=> 2015-11-12 00:00:00 +0900
```

For JST also, only DateTime worked.

```
irb(main):005:0> ENV['TZ'] = 'UTC'
=> "UTC"
irb(main):006:0> DateTime.strptime('2015-11-12 JST', '%Y-%m-%d %Z')
=> #<DateTime: 2015-11-12T00:00:00+09:00 ((2457338j,54000s,0n),+32400s,2299161j)>
irb(main):007:0> Time.strptime('2015-11-12 JST', '%Y-%m-%d %Z')
=> 2015-11-12 00:00:00 +0000
```

For PST, both worked.

```
irb(main):004:0> DateTime.strptime('2015-11-12 PST', '%Y-%m-%d %Z')
=> #<DateTime: 2015-11-12T00:00:00-08:00 ((2457339j,28800s,0n),-28800s,2299161j)>
irb(main):003:0> Time.strptime('2015-11-12 PST', '%Y-%m-%d %Z')
=> 2015-11-12 00:00:00 -0800
```

I felt DateTime.strptime and Time.strptime should have compatibility.



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