feat: add configurable date display formats [3.x]

[ManukMinasyan]

Summary

• Add configurable date display formats via CustomFieldsPlugin (Filament-idiomatic) and CustomFields facade
• All Filament components (forms, tables, infolists) and validation messages respect the configured format
• When no format is configured (default), each component uses its original hardcoded format (full BC)

Usage

Via Plugin (recommended)

CustomFieldsPlugin::make()
    ->authorize(fn () => auth()->user()->isAdmin())
    ->dateDisplayFormat('m/d/Y')
    ->dateTimeDisplayFormat('m/d/Y h:i A')

Via Facade

// In AppServiceProvider::boot()
CustomFields::useDateDisplayFormat('m/d/Y');
CustomFields::useDateTimeDisplayFormat('m/d/Y h:i A');

Components Updated

Component	Default (unchanged)	Reads from
CustomFieldsPlugin	--	Sets facade values in boot()
DateComponent (form)	Y-m-d	dateDisplayFormat()
DateTimeComponent (form)	Y-m-d H:i:s	dateTimeDisplayFormat()
DateTimeColumn (table)	M j, Y / M j, Y H:i	Both
DateTimeEntry (infolist)	Y-m-d / Y-m-d H:i:s	Both
DateConstraintRule (validation)	M j, Y	dateDisplayFormat()

Not changed (intentionally)

• AbstractFormComponent::getFieldValue() -- storage format for hydration (Y-m-d), not display
• ImportColumnConfigurator -- storage format for parsing imports
• DateConstraintField -- management UI date picker storage format

Test plan

• Verify default behavior unchanged when no format configured
• Verify plugin configuration applies to all components
• Verify facade configuration applies to all components
• Verify validation messages use configured format
• PHPStan passes
• Pint passes
• 459/466 tests pass (7 pre-existing failures unrelated to this change)

[Copilot]

Pull request overview

Adds global configuration hooks to control how date and datetime custom fields are displayed across the package’s Filament integrations, while aiming to preserve each component’s existing defaults when unset.

Changes:

• Introduces CustomFields::useDateDisplayFormat() / useDateTimeDisplayFormat() plus getters to store global display format configuration.
• Updates Filament form date/datetime pickers to use configured display formats.
• Updates Filament table column + infolist entry rendering to format date/datetime values using the configured formats.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/CustomFields.php	Adds static configuration storage + API for date/datetime display formats.
src/Filament/Integration/Components/Forms/DateComponent.php	Reads configured date display format for DatePicker display/placeholder.
src/Filament/Integration/Components/Forms/DateTimeComponent.php	Reads configured datetime display format for DateTimePicker display/placeholder.
src/Filament/Integration/Components/Tables/Columns/DateTimeColumn.php	Formats date/datetime table values using configured formats.
src/Filament/Integration/Components/Infolists/DateTimeEntry.php	Formats infolist date/datetime display using configured formats.