diff --git a/Libraries/LibJS/Runtime/DateConstructor.cpp b/Libraries/LibJS/Runtime/DateConstructor.cpp
index 2acfc149314..1488bb0259a 100644
--- a/Libraries/LibJS/Runtime/DateConstructor.cpp
+++ b/Libraries/LibJS/Runtime/DateConstructor.cpp
@@ -25,7 +25,7 @@ namespace JS {
 GC_DEFINE_ALLOCATOR(DateConstructor);
 
 // 21.4.3.2 Date.parse ( string ), https://tc39.es/ecma262/#sec-date.parse
-static double parse_simplified_iso8601(ByteString const& iso_8601)
+static Optional<double> parse_simplified_iso8601(ByteString const& iso_8601)
 {
     // 21.4.1.15 Date Time String Format, https://tc39.es/ecma262/#sec-date-time-string-format
     GenericLexer lexer(iso_8601);
@@ -127,9 +127,8 @@ static double parse_simplified_iso8601(ByteString const& iso_8601)
     };
     auto lex_time = [&]() { return lex_hours_minutes(hours, minutes) && (!lexer.consume_specific(':') || lex_seconds_milliseconds()) && lex_timezone(); };
 
-    if (!lex_date() || (lexer.consume_specific('T') && !lex_time()) || !lexer.is_eof()) {
-        return NAN;
-    }
+    if (!lex_date() || (lexer.consume_specific('T') && !lex_time()) || !lexer.is_eof())
+        return {};
 
     // We parsed a valid date simplified ISO 8601 string.
     VERIFY(year.has_value()); // A valid date string always has at least a year.
@@ -154,9 +153,8 @@ static double parse_date_string(VM& vm, ByteString const& date_string)
     if (date_string.is_empty())
         return NAN;
 
-    auto value = parse_simplified_iso8601(date_string);
-    if (isfinite(value))
-        return value;
+    if (auto time = parse_simplified_iso8601(date_string); time.has_value())
+        return *time;
 
     // Date.parse() is allowed to accept an arbitrary number of implementation-defined formats.
     // FIXME: Exactly what timezone and which additional formats we should support is unclear.
diff --git a/Libraries/LibJS/Tests/builtins/Date/Date.parse.js b/Libraries/LibJS/Tests/builtins/Date/Date.parse.js
index 2490cefe2bc..b4be2553a8f 100644
--- a/Libraries/LibJS/Tests/builtins/Date/Date.parse.js
+++ b/Libraries/LibJS/Tests/builtins/Date/Date.parse.js
@@ -67,6 +67,12 @@ test("basic functionality", () => {
 test("time clip", () => {
     expect(Date.parse("+999999")).toBeNaN();
     expect(Date.parse("-999999")).toBeNaN();
+
+    const belowMinDate = "-271821-04-19T23:59:59.999Z";
+    expect(belowMinDate).toBeNaN();
+
+    const aboveMaxDate = "+275760-09-13T00:00:00.001Z";
+    expect(aboveMaxDate).toBeNaN();
 });
 
 test("extra micro seconds extension", () => {