Deprecate DateTimePlugs::DATE_RFC7231 constant

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Seems like a valid thing, maybe even more for php8+

Tagging for framework manager for their thoughts?

Also not positive this will need a test or not.

The Needs Review Queue Bot → tested this issue. It either no longer applies to Drupal core, or fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

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Fixed failed commands on #2
Attached patch against Drupal 10.1.x
Attached reroll patch

Link needs to point to a change record not the issue. Doesn't make sense to write the change record until the Framework Review has happened. So back to NR for the patch in #2.

The Needs Review Queue Bot → tested this issue. It fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

Apart from a re-roll or rebase, this issue may need more work to address feedback in the issue or MR comments. To progress an issue, incorporate this feedback as part of the process of updating the issue. This helps other contributors to know what is outstanding.

Consult the Drupal Contributor Guide → to find step-by-step guides for working with issues.

per #13

The Needs Review Queue Bot → tested this issue. It fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

Apart from a re-roll or rebase, this issue may need more work to address feedback in the issue or MR comments. To progress an issue, incorporate this feedback as part of the process of updating the issue. This helps other contributors to know what is outstanding.

Consult the Drupal Contributor Guide → to find step-by-step guides for working with issues.

Now the tag should work, sorry for the noise.

Fix command failures in #10

+++ b/core/lib/Drupal/Component/Datetime/DateTimePlus.php
@@ -49,8 +49,15 @@ class DateTimePlus {
+   * @deprecated in drupal:9.1.0 and is removed from drupal:10.0.0.

This will need updating now

We also need to check we're not using it anywhere in core

done changes as mentioned on #19

Removing credit for #20 as it removed the deprecation

@larowlan these are the instances it's used so they will have to be updated too.

Since we are deprecating will need a change record too