diff --git a/prowler/providers/aws/services/acm/acm_certificates_expiration_check/acm_certificates_expiration_check.py b/prowler/providers/aws/services/acm/acm_certificates_expiration_check/acm_certificates_expiration_check.py
index f8af3ead..0557c513 100644
--- a/prowler/providers/aws/services/acm/acm_certificates_expiration_check/acm_certificates_expiration_check.py
+++ b/prowler/providers/aws/services/acm/acm_certificates_expiration_check/acm_certificates_expiration_check.py
@@ -19,7 +19,11 @@ class acm_certificates_expiration_check(Check):
                 report.resource_tags = certificate.tags
             else:
                 report.status = "FAIL"
-                report.status_extended = f"ACM Certificate {certificate.id} for {certificate.name} is about to expire in {DAYS_TO_EXPIRE_THRESHOLD} days."
+                if certificate.expiration_days < 0:
+                    report.status_extended = f"ACM Certificate {certificate.id} for {certificate.name} has expired ({abs(certificate.expiration_days)} days ago)."
+                else:
+                    report.status_extended = f"ACM Certificate {certificate.id} for {certificate.name} is about to expire in {certificate.expiration_days} days."
+
                 report.resource_id = certificate.id
                 report.resource_details = certificate.name
                 report.resource_arn = certificate.arn
diff --git a/tests/providers/aws/services/acm/acm_certificates_expiration_check/acm_certificates_expiration_check_test.py b/tests/providers/aws/services/acm/acm_certificates_expiration_check/acm_certificates_expiration_check_test.py
index dee88196..010e84f1 100644
--- a/tests/providers/aws/services/acm/acm_certificates_expiration_check/acm_certificates_expiration_check_test.py
+++ b/tests/providers/aws/services/acm/acm_certificates_expiration_check/acm_certificates_expiration_check_test.py
@@ -32,6 +32,7 @@ class Test_acm_certificates_expiration_check:
         certificate_arn = f"arn:aws:acm:{AWS_REGION}:{AWS_ACCOUNT_NUMBER}:certificate/{certificate_id}"
         certificate_name = "test-certificate.com"
         certificate_type = "AMAZON_ISSUED"
+        expiration_days = 5
 
         acm_client = mock.MagicMock
         acm_client.certificates = [
@@ -40,7 +41,7 @@ class Test_acm_certificates_expiration_check:
                 id=certificate_id,
                 name=certificate_name,
                 type=certificate_type,
-                expiration_days=5,
+                expiration_days=expiration_days,
                 transparency_logging=True,
                 region=AWS_REGION,
             )
@@ -62,7 +63,50 @@ class Test_acm_certificates_expiration_check:
             assert result[0].status == "FAIL"
             assert (
                 result[0].status_extended
-                == f"ACM Certificate {certificate_id} for {certificate_name} is about to expire in {DAYS_TO_EXPIRE_THRESHOLD} days."
+                == f"ACM Certificate {certificate_id} for {certificate_name} is about to expire in {expiration_days} days."
+            )
+            assert result[0].resource_id == certificate_id
+            assert result[0].resource_arn == certificate_arn
+            assert result[0].region == AWS_REGION
+            assert result[0].resource_tags == []
+
+    def test_acm_certificate_expirated_long_time(self):
+        certificate_id = str(uuid.uuid4())
+        certificate_arn = f"arn:aws:acm:{AWS_REGION}:{AWS_ACCOUNT_NUMBER}:certificate/{certificate_id}"
+        certificate_name = "test-certificate.com"
+        certificate_type = "AMAZON_ISSUED"
+        expiration_days = -400
+
+        acm_client = mock.MagicMock
+        acm_client.certificates = [
+            Certificate(
+                arn=certificate_arn,
+                id=certificate_id,
+                name=certificate_name,
+                type=certificate_type,
+                expiration_days=expiration_days,
+                transparency_logging=True,
+                region=AWS_REGION,
+            )
+        ]
+
+        with mock.patch(
+            "prowler.providers.aws.services.acm.acm_service.ACM",
+            new=acm_client,
+        ):
+            # Test Check
+            from prowler.providers.aws.services.acm.acm_certificates_expiration_check.acm_certificates_expiration_check import (
+                acm_certificates_expiration_check,
+            )
+
+            check = acm_certificates_expiration_check()
+            result = check.execute()
+
+            assert len(result) == 1
+            assert result[0].status == "FAIL"
+            assert (
+                result[0].status_extended
+                == f"ACM Certificate {certificate_id} for {certificate_name} has expired ({abs(expiration_days)} days ago)."
             )
             assert result[0].resource_id == certificate_id
             assert result[0].resource_arn == certificate_arn