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Date: Mon, 22 May 2023 00:06:14 +0200
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To: Hans Henrik Bergan <divinity76@gmail.com>
Cc: Larry Garfield <larry@garfieldtech.com>, php internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Deprecation of the formats DATE_ISO8601 and DATE_RFC7231
From: jorg.sowa@gmail.com (Jorg Sowa)

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> What do you mean? Do you mean that the constant was legal at some point?

Sorry, but I don't have this knowledge. It's invalid since 2004, but I
suppose this format was implemented before then. Undoubtedly the format is
invalid now.

The usage in 1000 most popular libraries:
DATE_ISO8601 (4 packages, 1 in comments)
DateTimeInterface::ISO8601 (18 packages)
DateTimeInterface::RFC7231 (1 package - Jetbrains/phpstorm-stubs)
DATE_RFC7231 (1 package - Jetbrains/phpstorm-stubs)

Most of the packages already inform about deprecation. PHP stubs by
Jetbrans warn about deprecation, although it's not officially.

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