e6e235b6f4
This PR was squashed before being merged into the 2.7 branch (closes #25781).
Discussion
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[Form] Disallow transform dates beyond the year 9999
Fixes #14727
| Q | A
| ------------- | ---
| Branch? | 2.7
| Bug fix? | yes
| New feature? | no
| BC breaks? | not really
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | #14727
| License | MIT
Explicitly locked out submission of dates beyond December 31st 9999 in forms as PHP is highly incapable of consistently handling such dates. Before this patch dates were randomly transformed or mangled.
Technically there is a BC break as this will now cause validation to fail on input that was *accepted* before, but it was mangled. Not my call but I prefer the rejection over data corruption:
```
// Old behavior
$transformer = new DateTimeToLocalizedStringTransformer('UTC', 'UTC', null, null, \IntlDateFormatter::GREGORIAN, 'yyyy-MM-dd');
$result = $transformer->reverseTransform('20107-03-21');
// $result is now 2007-03-21
```
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