[ruby-core:121066] [Ruby master Bug#21141] `Time#utc?` does not work with a timezone object

15 Feb 2025

      Issue #21141 has been reported by nobu (Nobuyoshi Nakada).

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Bug #21141: `Time#utc?` does not work with a timezone object
https://bugs.ruby-lang.org/issues/21141

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Backport: 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED
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```ruby
require 'timezone'
require 'tzinfo'

t = Time.now(in: "UTC")
t_timezone = Time.now(in: Timezone["UTC"])
t_tzinfo = Time.now(in: TZInfo::Timezone.get("UTC"))
p t.utc?          #=> true
p t_timezone.utc? #=> false
p t_tzinfo.utc?   #=> false
```

This also affects `strftime("%-z")`.

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