Bug #21141: `Time#utc?` does not work with a timezone object

• Status: Open
• Assignee: -
• Target version: -
• Backport: 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED

[nobu (Nobuyoshi Nakada)]

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").

[nobu (Nobuyoshi Nakada)]

Maybe also this is related:

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?