diff --git a/system/I18n/Time.php b/system/I18n/Time.php
index 64b4d350e8fd..659a0a252db2 100644
--- a/system/I18n/Time.php
+++ b/system/I18n/Time.php
@@ -82,7 +82,7 @@ public function __construct(?string $time = null, $timezone = null, ?string $loc
         // If a test instance has been provided, use it instead.
         if ($time === '' && static::$testNow instanceof self) {
             $timezone = $timezone ?: static::$testNow->getTimezone();
-            $time     = (string) static::$testNow->toDateTimeString();
+            $time     = static::$testNow->format('Y-m-d H:i:s');
         }
 
         $timezone       = $timezone ?: date_default_timezone_get();
@@ -1005,7 +1005,7 @@ public function isAfter($testTime, ?string $timezone = null): bool
      */
     public function humanize()
     {
-        $now  = IntlCalendar::fromDateTime(self::now($this->timezone)->toDateTimeString());
+        $now  = IntlCalendar::fromDateTime(self::now($this->timezone));
         $time = $this->getCalendar()->getTime();
 
         $years   = $now->fieldDifference($time, IntlCalendar::FIELD_YEAR);
@@ -1106,7 +1106,7 @@ public function getUTCObject($time, ?string $timezone = null)
      */
     public function getCalendar()
     {
-        return IntlCalendar::fromDateTime($this->toDateTimeString());
+        return IntlCalendar::fromDateTime($this);
     }
 
     /**
diff --git a/tests/system/I18n/TimeTest.php b/tests/system/I18n/TimeTest.php
index 03f142479478..2f2980f2411e 100644
--- a/tests/system/I18n/TimeTest.php
+++ b/tests/system/I18n/TimeTest.php
@@ -11,8 +11,10 @@
 
 namespace CodeIgniter\I18n;
 
+use CodeIgniter\Config\Factories;
 use CodeIgniter\I18n\Exceptions\I18nException;
 use CodeIgniter\Test\CIUnitTestCase;
+use Config\App;
 use DateTime;
 use DateTimeZone;
 use IntlDateFormatter;
@@ -1025,6 +1027,31 @@ public function testHumanizeNow()
         $this->assertSame('Just now', $time->humanize());
     }
 
+    /**
+     * @see https://github.com/codeigniter4/CodeIgniter4/issues/4708
+     */
+    public function testHumanizeWithArLocale()
+    {
+        $this->resetServices();
+
+        $currentLocale = Locale::getDefault();
+        Locale::setDefault('ar');
+
+        $config                   = new App();
+        $config->supportedLocales = ['ar'];
+        $config->defaultLocale    = 'ar';
+        Factories::injectMock('config', 'App', $config);
+
+        Time::setTestNow('2022-06-14 12:00', 'America/Chicago');
+
+        $date = '2022-06-07 12:00';
+        $time = Time::parse($date, 'America/Chicago');
+
+        $this->assertSame('١ week ago', $time->humanize());
+
+        Locale::setDefault($currentLocale);
+    }
+
     public function testSetTimezoneDate()
     {
         $time  = Time::parse('13 May 2020 10:00', 'GMT');
@@ -1058,4 +1085,18 @@ public function testUnserializeTimeObject()
         $this->assertTrue($time2->equals($time1));
         $this->assertNotSame($time1, $time2);
     }
+
+    public function testSetTestNowWithFaLocale()
+    {
+        $currentLocale = Locale::getDefault();
+        Locale::setDefault('fa');
+
+        Time::setTestNow('2017/03/10 12:00', 'Asia/Tokyo');
+
+        $now = Time::now()->format('c');
+
+        $this->assertSame('2017-03-10T12:00:00+09:00', $now);
+
+        Locale::setDefault($currentLocale);
+    }
 }