Added PHP 8.4 support

Author: Emre Çalışkan

src/Carbon/CarbonTimeZone.php

@@ -155,7 +155,7 @@ public function getAbbr($dst = false)
      *
      * @return string
      */
-    public function toOffsetName(DateTimeInterface $date = null)
+    public function toOffsetName(?DateTimeInterface $date = null)
     {
         return static::getOffsetNameFromMinuteOffset(
             $this->getOffset($date ?: Carbon::now($this)) / 60
@@ -169,7 +169,7 @@ public function toOffsetName(DateTimeInterface $date = null)
      *
      * @return CarbonTimeZone
      */
-    public function toOffsetTimeZone(DateTimeInterface $date = null)
+    public function toOffsetTimeZone(?DateTimeInterface $date = null)
     {
         return new static($this->toOffsetName($date));
     }
@@ -185,7 +185,7 @@ public function toOffsetTimeZone(DateTimeInterface $date = null)
      *
      * @return string|false
      */
-    public function toRegionName(DateTimeInterface $date = null, $isDst = 1)
+    public function toRegionName(?DateTimeInterface $date = null, $isDst = 1)
     {
         $name = $this->getName();
         $firstChar = substr($name, 0, 1);
@@ -227,7 +227,7 @@ public function toRegionName(DateTimeInterface $date = null, $isDst = 1)
      *
      * @return CarbonTimeZone|false
      */
-    public function toRegionTimeZone(DateTimeInterface $date = null)
+    public function toRegionTimeZone(?DateTimeInterface $date = null)
     {
         $tz = $this->toRegionName($date);
 

src/Carbon/Traits/Date.php

@@ -1391,7 +1391,7 @@ public function isoWeekday($value = null)
      *
      * @return int
      */
-    public function getDaysFromStartOfWeek(int $weekStartsAt = null): int
+    public function getDaysFromStartOfWeek(?int $weekStartsAt = null): int
     {
         $firstDay = (int) ($weekStartsAt ?? $this->getTranslationMessage('first_day_of_week') ?? 0);
 
@@ -1409,7 +1409,7 @@ public function getDaysFromStartOfWeek(int $weekStartsAt = null): int
      *
      * @return static
      */
-    public function setDaysFromStartOfWeek(int $numberOfDays, int $weekStartsAt = null)
+    public function setDaysFromStartOfWeek(int $numberOfDays, ?int $weekStartsAt = null)
     {
         return $this->addDays($numberOfDays - $this->getDaysFromStartOfWeek($weekStartsAt));
     }
@@ -1478,7 +1478,7 @@ public function subUnitNoOverflow($valueUnit, $value, $overflowUnit)
      *
      * @return int|static
      */
-    public function utcOffset(int $minuteOffset = null)
+    public function utcOffset(?int $minuteOffset = null)
     {
         if (\func_num_args() < 1) {
             return $this->offsetMinutes;

src/Carbon/Traits/Localization.php

@@ -444,7 +444,7 @@ public function translateTimeStringTo($timeString, $to = null)
      *
      * @return $this|string
      */
-    public function locale(string $locale = null, ...$fallbackLocales)
+    public function locale(?string $locale = null, ...$fallbackLocales)
     {
         if ($locale === null) {
             return $this->getTranslatorLocale();

src/Carbon/Traits/Test.php

@@ -200,7 +200,7 @@ protected static function mockConstructorParameters(&$time, $tz)
             : $testInstance->format(static::MOCK_DATETIME_FORMAT);
     }
 
-    private static function setDefaultTimezone($timezone, DateTimeInterface $date = null)
+    private static function setDefaultTimezone($timezone, ?DateTimeInterface $date = null)
     {
         $previous = null;
         $success = false;