LibJS: Explicitly handle invalid Date objects in local time setters

This is a normative change in the ECMA-262 spec:
ca53334

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setDate.js

@@ -30,3 +30,9 @@ test("Day as argument", () => {
     expect(date.getSeconds()).toBe(0);
     expect(date.getMilliseconds()).toBe(0);
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setDate(15)).toBeNaN();
+    expect(date.getDate()).toBeNaN();
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setFullYear.js

@@ -110,3 +110,9 @@ test("Make Invalid Date valid again", () => {
     expect(date.getSeconds()).toBe(0);
     expect(date.getMilliseconds()).toBe(0);
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    date.setFullYear(2022);
+    expect(date.getFullYear()).toBe(2022);
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setHours.js

@@ -25,3 +25,9 @@ test("basic functionality", () => {
     d.setHours("a");
     expect(d.getHours()).toBe(NaN);
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setHours(2)).toBeNaN();
+    expect(date.getHours()).toBeNaN();
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setMilliseconds.js

@@ -10,3 +10,9 @@ test("basic functionality", () => {
     d.setMilliseconds("a");
     expect(d.getMilliseconds()).toBe(NaN);
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setMilliseconds(2)).toBeNaN();
+    expect(date.getMilliseconds()).toBeNaN();
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setMinutes.js

@@ -19,3 +19,9 @@ test("basic functionality", () => {
     d.setMinutes("a");
     expect(d.getMinutes()).toBe(NaN);
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setMinutes(2)).toBeNaN();
+    expect(date.getMinutes()).toBeNaN();
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setMonth.js

@@ -61,3 +61,9 @@ test("NaN or undefined in any arguments", () => {
     date.setMonth(2021, undefined);
     expect(date.getTime()).toBe(NaN);
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setMonth(2)).toBeNaN();
+    expect(date.getMonth()).toBeNaN();
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setSeconds.js

@@ -14,3 +14,9 @@ test("basic functionality", () => {
     d.setSeconds("a");
     expect(d.getSeconds()).toBe(NaN);
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setSeconds(2)).toBeNaN();
+    expect(date.getSeconds()).toBeNaN();
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setTime.js

@@ -45,3 +45,9 @@ test("Make Invalid Date valid again", () => {
     expect(date.getUTCSeconds()).toBe(46);
     expect(date.getUTCMilliseconds()).toBe(0);
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setTime(1622993746000)).toBe(1622993746000);
+    expect(date.getTime()).toBe(1622993746000);
+});