From: kylekatarnls <kylekatarnls@gmail.com>
Date: Fri, 4 Apr 2025 19:51:20 +0200
Subject: Fix overflow issue for is-month

Backported from 3.x.

Origin: https://github.com/briannesbitt/Carbon/commit/1887f86e3be1a936513376f6663227bfe8061a5a
---
 src/Carbon/Traits/Comparison.php | 2 +-
 tests/Carbon/IsTest.php          | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/Carbon/Traits/Comparison.php b/src/Carbon/Traits/Comparison.php
index daee19c..f8e1e78 100644
--- a/src/Carbon/Traits/Comparison.php
+++ b/src/Carbon/Traits/Comparison.php
@@ -995,7 +995,7 @@ trait Comparison
         }
 
         if (preg_match('/^(?:Jan|January|Feb|February|Mar|March|Apr|April|May|Jun|June|Jul|July|Aug|August|Sep|September|Oct|October|Nov|November|Dec|December)$/i', $tester)) {
-            return $this->isSameMonth(static::parse($tester), false);
+            return $this->isSameMonth(static::parse("$tester 1st"), false);
         }
 
         if (preg_match('/^\d{3,}-\d{1,2}$/', $tester)) {
diff --git a/tests/Carbon/IsTest.php b/tests/Carbon/IsTest.php
index 057a455..0a46e7d 100644
--- a/tests/Carbon/IsTest.php
+++ b/tests/Carbon/IsTest.php
@@ -19,6 +19,7 @@ use DateTime;
 use Generator;
 use InvalidArgumentException;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use stdClass;
 use Tests\AbstractTestCase;
 
@@ -1017,8 +1018,12 @@ class IsTest extends AbstractTestCase
         $date->isCurrentFoobar();
     }
 
-    public function testIs()
+    #[TestWith([null])]
+    #[TestWith(['2025-03-31 12:00'])]
+    public function testIs(?string $testNow)
     {
+        Carbon::setTestNow($testNow);
+
         $this->assertTrue(Carbon::parse('2019-06-02 12:23:45')->is('2019'));
         $this->assertFalse(Carbon::parse('2019-06-02 12:23:45')->is('2018'));
         $this->assertTrue(Carbon::parse('2019-06-02 12:23:45')->is('2019-06'));
@@ -1048,6 +1053,8 @@ class IsTest extends AbstractTestCase
         $this->assertTrue(Carbon::parse('2019-06-02 15:23:45')->is('3pm'));
         $this->assertFalse(Carbon::parse('2019-06-02 15:23:45')->is('4pm'));
         $this->assertFalse(Carbon::parse('2019-06-02 15:23:45')->is('3am'));
+        $this->assertTrue(Carbon::parse('2019-06-02 12:23:45')->is('2019-06'));
+        $this->assertTrue(Carbon::parse('2019-05-31 12:23:45')->is('2019-05'));
         $this->assertTrue(Carbon::parse('2019-06-02 12:23:45')->is('2019-06-02 12:23'));
         $this->assertFalse(Carbon::parse('2019-06-02 12:23:45')->is('2019-06-03 12:23'));
         $this->assertFalse(Carbon::parse('2019-06-02 12:23:45')->is('2019-06-02 15:23'));