diff --git a/quickjs.c b/quickjs.c
index f0620ea..72390c5 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -47444,7 +47444,7 @@ static JSValue get_date_string(JSContext *ctx, JSValue this_val,
             break;
         case 3:
             pos += snprintf(buf + pos, sizeof(buf) - pos,
-                            "%02d:%02d:%02d %cM", (h + 1) % 12 - 1, m, s,
+                            "%02d:%02d:%02d %cM", (h + 11) % 12 + 1, m, s,
                             (h < 12) ? 'A' : 'P');
             break;
         }
diff --git a/tests/test_builtin.js b/tests/test_builtin.js
index 468f446..e5ecb8c 100644
--- a/tests/test_builtin.js
+++ b/tests/test_builtin.js
@@ -697,6 +697,14 @@ function test_date()
     assert(Date.UTC(2017, 9, 22, 18 - 1e10, 10 + 60e10), 1508695800000);
     assert(Date.UTC(2017, 9, 22, 18, 10 - 1e10, 11 + 60e10), 1508695811000);
     assert(Date.UTC(2017, 9, 22, 18, 10, 11 - 1e12, 91 + 1000e12), 1508695811091);
+    assert(new Date("2024 Apr 7 1:00 AM").toLocaleString(), "04/07/2024, 01:00:00 AM");
+    assert(new Date("2024 Apr 7 2:00 AM").toLocaleString(), "04/07/2024, 02:00:00 AM");
+    assert(new Date("2024 Apr 7 11:00 AM").toLocaleString(), "04/07/2024, 11:00:00 AM");
+    assert(new Date("2024 Apr 7 12:00 AM").toLocaleString(), "04/07/2024, 12:00:00 AM");
+    assert(new Date("2024 Apr 7 1:00 PM").toLocaleString(), "04/07/2024, 01:00:00 PM");
+    assert(new Date("2024 Apr 7 2:00 PM").toLocaleString(), "04/07/2024, 02:00:00 PM");
+    assert(new Date("2024 Apr 7 11:00 PM").toLocaleString(), "04/07/2024, 11:00:00 PM");
+    assert(new Date("2024 Apr 7 12:00 PM").toLocaleString(), "04/07/2024, 12:00:00 PM");
 }
 
 function test_regexp()