[4.x] Adds closure evaluation to TimezoneManager (#18544)

* Adds closure evaluation to the timezone manager

* Update TimezoneManager.php

* Update FilamentTimezone.php

---------

Co-authored-by: Dan Harrin <[email protected]>

Author: Mrkbingham

packages/support/src/Facades/FilamentTimezone.php

@@ -2,11 +2,12 @@
 
 namespace Filament\Support\Facades;
 
+use Closure;
 use Filament\Support\TimezoneManager;
 use Illuminate\Support\Facades\Facade;
 
 /**
- * @method static void set(?string $timezone)
+ * @method static void set(string | Closure | null $timezone)
  * @method static string get()
  *
  * @see TimezoneManager

packages/support/src/TimezoneManager.php

@@ -2,17 +2,22 @@
 
 namespace Filament\Support;
 
+use Closure;
+use Filament\Support\Concerns\EvaluatesClosures;
+
 class TimezoneManager
 {
-    protected ?string $timezone = null;
+    use EvaluatesClosures;
+
+    protected string | Closure | null $timezone = null;
 
-    public function set(?string $timezone): void
+    public function set(string | Closure | null $timezone = null): void
     {
         $this->timezone = $timezone;
     }
 
     public function get(): string
     {
-        return $this->timezone ?? config('app.timezone');
+        return $this->evaluate($this->timezone) ?? config('app.timezone');
     }
 }