From: "nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date: 2025-02-15T07:46:06+00:00
Subject: [ruby-core:121067] [Ruby master Bug#21141] `Time#utc?` does not work with a timezone object

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


Maybe also this is related:

```ruby
ENV["TZ"] = "UTC"
p Time.now.utc? #=> false
```

Is it expected?
In other words, is that `Time#utc?` is true a special case, only when the time is created with the methods such as `Time.utc`, `Time#utc`, etc, that clearly return a UTC time object?

----------------------------------------
Bug #21141: `Time#utc?` does not work with a timezone object
https://bugs.ruby-lang.org/issues/21141#change-111983

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Backport: 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED
----------------------------------------
```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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