LibJS: Start implementing Date :^)

This adds:

- A global Date object (with `length` property and `now` function)
- The Date constructor (no arguments yet)
- The Date prototype (with `get*` functions)

Libraries/LibJS/Tests/Date.now.js

@@ -0,0 +1,15 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var last = 0;
+    for (var i = 0; i < 100; ++i) {
+        var now = Date.now();
+        assert(!isNaN(now))
+        assert(now > 1580000000000);
+        assert(now >= last);
+        last = now;
+    }
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getDate.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getDate()));
+    assert(1 <= d.getDate() <= 31);
+    assert(d.getDate() === d.getDate());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getDay.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getDay()));
+    assert(0 <= d.getDay() <= 6);
+    assert(d.getDay() === d.getDay());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getFullYear.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getFullYear()));
+    assert(d.getFullYear() >= 2020);
+    assert(d.getFullYear() === d.getFullYear());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getHours.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getHours()));
+    assert(0 <= d.getHours() <= 23);
+    assert(d.getHours() === d.getHours());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getMilliseconds.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getMilliseconds()));
+    assert(0 <= d.getMilliseconds() <= 999);
+    assert(d.getMilliseconds() === d.getMilliseconds());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getMinutes.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getMinutes()));
+    assert(0 <= d.getMinutes() <= 59);
+    assert(d.getMinutes() === d.getMinutes());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getMonth.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getMonth()));
+    assert(0 <= d.getMonth() <= 11);
+    assert(d.getMonth() === d.getMonth());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getSeconds.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getSeconds()));
+    assert(0 <= d.getSeconds() <= 59);
+    assert(d.getSeconds() === d.getSeconds());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Date.prototype.getTime.js

@@ -0,0 +1,11 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var d = new Date();
+    assert(!isNaN(d.getTime()));
+    assert(d.getTime() > 1580000000000);
+    assert(d.getTime() === d.getTime());
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}