diff --git a/phpstan-baseline.php b/phpstan-baseline.php
index f0a882e68b01..bc4dd8e95716 100644
--- a/phpstan-baseline.php
+++ b/phpstan-baseline.php
@@ -7555,12 +7555,6 @@
 	'count' => 1,
 	'path' => __DIR__ . '/system/I18n/Time.php',
 ];
-$ignoreErrors[] = [
-	// identifier: method.childReturnType
-	'message' => '#^Return type \\(CodeIgniter\\\\I18n\\\\Time\\) of method CodeIgniter\\\\I18n\\\\Time\\:\\:setTimezone\\(\\) should be covariant with return type \\(static\\(DateTimeImmutable\\)\\) of method DateTimeImmutable\\:\\:setTimezone\\(\\)$#',
-	'count' => 1,
-	'path' => __DIR__ . '/system/I18n/Time.php',
-];
 $ignoreErrors[] = [
 	// identifier: ternary.shortNotAllowed
 	'message' => '#^Short ternary operator is not allowed\\. Use null coalesce operator if applicable or consider using long ternary\\.$#',
@@ -7579,12 +7573,6 @@
 	'count' => 1,
 	'path' => __DIR__ . '/system/I18n/TimeLegacy.php',
 ];
-$ignoreErrors[] = [
-	// identifier: method.childReturnType
-	'message' => '#^Return type \\(CodeIgniter\\\\I18n\\\\TimeLegacy\\) of method CodeIgniter\\\\I18n\\\\TimeLegacy\\:\\:setTimezone\\(\\) should be covariant with return type \\(static\\(DateTime\\)\\) of method DateTime\\:\\:setTimezone\\(\\)$#',
-	'count' => 1,
-	'path' => __DIR__ . '/system/I18n/TimeLegacy.php',
-];
 $ignoreErrors[] = [
 	// identifier: ternary.shortNotAllowed
 	'message' => '#^Short ternary operator is not allowed\\. Use null coalesce operator if applicable or consider using long ternary\\.$#',
diff --git a/system/I18n/Time.php b/system/I18n/Time.php
index 906479470b17..255f879a90ec 100644
--- a/system/I18n/Time.php
+++ b/system/I18n/Time.php
@@ -39,6 +39,8 @@
  * @property-read string $weekOfYear
  * @property-read string $year
  *
+ * @phpstan-consistent-constructor
+ *
  * @see \CodeIgniter\I18n\TimeTest
  */
 class Time extends DateTimeImmutable implements Stringable
diff --git a/system/I18n/TimeLegacy.php b/system/I18n/TimeLegacy.php
index 403fced2108d..b62877ec40d6 100644
--- a/system/I18n/TimeLegacy.php
+++ b/system/I18n/TimeLegacy.php
@@ -39,6 +39,8 @@
  * @property string $weekOfYear  read-only
  * @property string $year        read-only
  *
+ * @phpstan-consistent-constructor
+ *
  * @deprecated Use Time instead.
  * @see \CodeIgniter\I18n\TimeLegacyTest
  */
diff --git a/system/I18n/TimeTrait.php b/system/I18n/TimeTrait.php
index fefb2fc544a3..0f02ef8820b8 100644
--- a/system/I18n/TimeTrait.php
+++ b/system/I18n/TimeTrait.php
@@ -261,13 +261,11 @@ public static function createFromFormat($format, $datetime, $timezone = null)
      *
      * @param DateTimeZone|string|null $timezone
      *
-     * @return self
-     *
      * @throws Exception
      */
-    public static function createFromTimestamp(int $timestamp, $timezone = null, ?string $locale = null)
+    public static function createFromTimestamp(float|int $timestamp, $timezone = null, ?string $locale = null): static
     {
-        $time = new self(gmdate('Y-m-d H:i:s', $timestamp), 'UTC', $locale);
+        $time = new static(gmdate('Y-m-d H:i:s', $timestamp), 'UTC', $locale);
 
         $timezone ??= date_default_timezone_get();
 
@@ -277,7 +275,7 @@ public static function createFromTimestamp(int $timestamp, $timezone = null, ?st
     /**
      * Takes an instance of DateTimeInterface and returns an instance of Time with it's same values.
      *
-     * @return self
+     * @return static
      *
      * @throws Exception
      */
@@ -286,7 +284,7 @@ public static function createFromInstance(DateTimeInterface $dateTime, ?string $
         $date     = $dateTime->format('Y-m-d H:i:s');
         $timezone = $dateTime->getTimezone();
 
-        return new self($date, $timezone, $locale);
+        return new static($date, $timezone, $locale);
     }
 
     /**
@@ -674,7 +672,7 @@ protected function setValue(string $name, $value)
      *
      * @param DateTimeZone|string $timezone
      *
-     * @return self
+     * @return static
      *
      * @throws Exception
      */
@@ -683,7 +681,7 @@ public function setTimezone($timezone)
     {
         $timezone = $timezone instanceof DateTimeZone ? $timezone : new DateTimeZone($timezone);
 
-        return self::createFromInstance($this->toDateTime()->setTimezone($timezone), $this->locale);
+        return static::createFromInstance($this->toDateTime()->setTimezone($timezone), $this->locale);
     }
 
     /**
diff --git a/user_guide_src/source/changelogs/v4.5.5.rst b/user_guide_src/source/changelogs/v4.5.5.rst
index f6799e484ebf..d3fecbfeb26e 100644
--- a/user_guide_src/source/changelogs/v4.5.5.rst
+++ b/user_guide_src/source/changelogs/v4.5.5.rst
@@ -14,6 +14,18 @@ Release Date: Unreleased
 BREAKING
 ********
 
+.. _v455-method-signature-changes:
+
+Method Signature Changes
+========================
+
+- **Time:** For PHP 8.4 compatibility only, the first parameter type of the
+  ``createFromTimestamp()`` method has been changed from ``int`` to ``int|float``,
+  and the return type ``static`` has been added. But **note that the**
+  ``createFromTimestamp()`` **method still cannot handle a float value, and the
+  behavior is not yet changed**. That is, the behavior is not the exactly same as
+  PHP 8.4's ``DateTimeImmutable::createFromTimestamp()`` method.
+
 ***************
 Message Changes
 ***************
diff --git a/user_guide_src/source/installation/upgrade_455.rst b/user_guide_src/source/installation/upgrade_455.rst
index bbff938631c5..3ec6d1443cb4 100644
--- a/user_guide_src/source/installation/upgrade_455.rst
+++ b/user_guide_src/source/installation/upgrade_455.rst
@@ -20,6 +20,13 @@ Mandatory File Changes
 Breaking Changes
 ****************
 
+Method Signature Changes
+========================
+
+Some method signature changes have been made. Classes that extend them should
+update their APIs to reflect the changes. See :ref:`ChangeLog <v455-method-signature-changes>`
+for details.
+
 *********************
 Breaking Enhancements
 *********************