Add a helper TimeZone::fromDefaultTimeZone static constructor

Author: finwe

src/TimeZone.php

@@ -88,6 +88,13 @@ public static function fromNativeDateTimeZone(DateTimeZone $dateTimeZone): TimeZ
         return $parsed;
     }
 
+    public static function fromDefaultTimeZone(): TimeZone
+    {
+        return static::fromNativeDateTimeZone(date_default_timezone_get() === false
+            ? new DateTimeZone('UTC')
+            : new DateTimeZone(date_default_timezone_get()));
+    }
+
     /**
      * Returns an equivalent native `DateTimeZone` object for this TimeZone.
      */

tests/TimeZoneTest.php

@@ -101,4 +101,18 @@ public static function providerFromNativeDateTimeZone(): iterable
             yield ['-02:30:30'];
         }
     }
+
+    public function testFromDefaultTimeZone(): void
+    {
+        $defaultTimeZone = date_default_timezone_get();
+        if ($defaultTimeZone === false) {
+            $defaultTimeZone = 'UTC';
+        }
+
+        $timeZone = TimeZone::fromDefaultTimeZone();
+
+        self::assertInstanceOf(TimeZone::class, $timeZone);
+        self::assertSame($defaultTimeZone, $timeZone->getId());
+    }
+
 }