diff --git a/src/Symfony/Component/Clock/CHANGELOG.md b/src/Symfony/Component/Clock/CHANGELOG.md
index 1a9ffc835f697..254e71c794b5e 100644
--- a/src/Symfony/Component/Clock/CHANGELOG.md
+++ b/src/Symfony/Component/Clock/CHANGELOG.md
@@ -5,6 +5,7 @@ CHANGELOG
 ---
 
  * Throw `DateMalformedStringException`/`DateInvalidTimeZoneException` when appropriate
+ * Add `$modifier` argument to the `now()` helper
 
 6.3
 ---
diff --git a/src/Symfony/Component/Clock/Resources/now.php b/src/Symfony/Component/Clock/Resources/now.php
index 9a88efbe4d43d..d4999fd922ad5 100644
--- a/src/Symfony/Component/Clock/Resources/now.php
+++ b/src/Symfony/Component/Clock/Resources/now.php
@@ -13,13 +13,29 @@
 
 if (!\function_exists(now::class)) {
     /**
-     * Returns the current time as a DateTimeImmutable.
-     *
-     * Note that you should prefer injecting a ClockInterface or using
-     * ClockAwareTrait when possible instead of using this function.
+     * @throws \DateMalformedStringException When the modifier is invalid
      */
-    function now(): \DateTimeImmutable
+    function now(string $modifier = null): \DateTimeImmutable
     {
-        return Clock::get()->now();
+        if (null === $modifier || 'now' === $modifier) {
+            return Clock::get()->now();
+        }
+
+        $now = Clock::get()->now();
+
+        if (\PHP_VERSION_ID < 80300) {
+            try {
+                $tz = (new \DateTimeImmutable($modifier, $now->getTimezone()))->getTimezone();
+            } catch (\Exception $e) {
+                throw new \DateMalformedStringException($e->getMessage(), $e->getCode(), $e);
+            }
+            $now = $now->setTimezone($tz);
+
+            return @$now->modify($modifier) ?: throw new \DateMalformedStringException(error_get_last()['message'] ?? sprintf('Invalid date modifier "%s".', $modifier));
+        }
+
+        $tz = (new \DateTimeImmutable($modifier, $now->getTimezone()))->getTimezone();
+
+        return $now->setTimezone($tz)->modify($modifier);
     }
 }
diff --git a/src/Symfony/Component/Clock/Tests/ClockTest.php b/src/Symfony/Component/Clock/Tests/ClockTest.php
index e88ade2558777..bf71543d3ce18 100644
--- a/src/Symfony/Component/Clock/Tests/ClockTest.php
+++ b/src/Symfony/Component/Clock/Tests/ClockTest.php
@@ -39,6 +39,19 @@ public function testNativeClock()
         $this->assertInstanceOf(NativeClock::class, Clock::get());
     }
 
+    public function testNowModifier()
+    {
+        $this->assertSame('2023-08-14', now('2023-08-14')->format('Y-m-d'));
+        $this->assertSame('Europe/Paris', now('Europe/Paris')->getTimezone()->getName());
+        $this->assertSame('UTC', now('UTC')->getTimezone()->getName());
+    }
+
+    public function testInvalidNowModifier()
+    {
+        $this->expectException(\DateMalformedStringException::class);
+        now('invalid date');
+    }
+
     public function testMockClockDisable()
     {
         $this->assertInstanceOf(NativeClock::class, Clock::get());
@@ -52,6 +65,7 @@ public function testMockClockFreeze()
         self::mockTime(new \DateTimeImmutable('2021-12-19'));
 
         $this->assertSame('2021-12-19', now()->format('Y-m-d'));
+        $this->assertSame('2021-12-20', now('+1 days')->format('Y-m-d'));
 
         self::mockTime('+1 days');
         $this->assertSame('2021-12-20', now()->format('Y-m-d'));