LibJS: Explicitly handle invalid Date objects in UTC time setters

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

Note that this also fixes a few errors where we errantly converted the
stored time value to local time.

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

@@ -33,3 +33,9 @@ describe("correct behavior", () => {
         expect(d.getUTCDate()).toBeNaN();
     });
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setUTCDate(15)).toBeNaN();
+    expect(date.getUTCDate()).toBeNaN();
+});

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

@@ -53,3 +53,9 @@ describe("correct behavior", () => {
         expect(d.getUTCFullYear()).toBeNaN();
     });
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    date.setUTCFullYear(2022);
+    expect(date.getUTCFullYear()).toBe(2022);
+});

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

@@ -63,3 +63,9 @@ describe("correct behavior", () => {
         expect(d.getUTCHours()).toBeNaN();
     });
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setUTCHours(2)).toBeNaN();
+    expect(date.getUTCHours()).toBeNaN();
+});

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

@@ -36,3 +36,9 @@ describe("correct behavior", () => {
         expect(d.getUTCMilliseconds()).toBeNaN();
     });
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setUTCMilliseconds(2)).toBeNaN();
+    expect(date.getUTCMilliseconds()).toBeNaN();
+});

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

@@ -49,3 +49,9 @@ describe("correct behavior", () => {
         expect(d.getUTCMinutes()).toBeNaN();
     });
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setUTCMinutes(2)).toBeNaN();
+    expect(date.getUTCMinutes()).toBeNaN();
+});

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

@@ -44,3 +44,9 @@ describe("correct behavior", () => {
         expect(d.getUTCMonth()).toBeNaN();
     });
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setUTCMonth(2)).toBeNaN();
+    expect(date.getUTCMonth()).toBeNaN();
+});

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

@@ -44,3 +44,9 @@ describe("correct behavior", () => {
         expect(d.getUTCSeconds()).toBeNaN();
     });
 });
+
+test("invalid date", () => {
+    let date = new Date(NaN);
+    expect(date.setUTCSeconds(2)).toBeNaN();
+    expect(date.getUTCSeconds()).toBeNaN();
+});