DateTimeZone does not return canonical timezone names for legacy/alias identifiers

[bedwal-deepak]

From manual page: https://php.net/datetimezone.listidentifiers

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The DateTimeZone class in PHP is not returning canonical timezone names when using valid alias/legacy identifiers such as:

• US/Eastern (expected: America/New_York)
• US/Central (expected: America/Chicago)
• Canada/Eastern (expected: America/Toronto)
• US/Pacific (expected: America/Los_Angeles)
• US/Hawaii (expected: Pacific/Honolulu)
• Etc/GMT (expected: Etc/GMT but validation fails in DateTimeZone::listIdentifiers())

These timezones are accepted by new DateTimeZone(), but:

• They do not appear in DateTimeZone::listIdentifiers(), causing validation rules to fail.
• DateTimeZone::getName() and DateTime::format('e') return the same alias instead of the canonical name.