diff --git a/Userland/Libraries/LibJS/Runtime/DateConstructor.cpp b/Userland/Libraries/LibJS/Runtime/DateConstructor.cpp
index 218a58db6f..d453a8a4d2 100644
--- a/Userland/Libraries/LibJS/Runtime/DateConstructor.cpp
+++ b/Userland/Libraries/LibJS/Runtime/DateConstructor.cpp
@@ -290,7 +290,7 @@ JS_DEFINE_NATIVE_FUNCTION(DateConstructor::now)
 {
     struct timeval tv;
     gettimeofday(&tv, nullptr);
-    return Value(tv.tv_sec * 1000.0 + tv.tv_usec / 1000.0);
+    return Value(floor(tv.tv_sec * 1000.0 + tv.tv_usec / 1000.0));
 }
 
 // 21.4.3.2 Date.parse ( string ), https://tc39.es/ecma262/#sec-date.parse
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Date/Date.now.js b/Userland/Libraries/LibJS/Tests/builtins/Date/Date.now.js
index 46c1b6d8cd..490787f6f5 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Date/Date.now.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Date/Date.now.js
@@ -3,6 +3,7 @@ test("basic functionality", () => {
     for (var i = 0; i < 100; ++i) {
         var now = Date.now();
         expect(now).not.toBeNaN();
+        expect(Math.floor(now)).toBe(now);
         expect(now).toBeGreaterThan(1580000000000);
         expect(now).toBeGreaterThanOrEqual(last);
         last = now;