LibJS: Handle ZonedDateTime in the various Temporal factories

Author: https://github.com/trflynn89
Commit: 3e6133cc09
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2577
Reviewed-by: https://github.com/shannonbooth ✅

Libraries/LibJS/Tests/builtins/Temporal/Instant/Instant.from.js

@@ -34,6 +34,11 @@ describe("correct behavior", () => {
         expect(result).toBeInstanceOf(Temporal.Instant);
         expect(result.epochNanoseconds).toBe(0n);
     });
+
+    test("ZonedDateTime instance argument", () => {
+        const zonedDateTime = new Temporal.ZonedDateTime(123n, "UTC");
+        expect(Temporal.Instant.from(zonedDateTime).epochNanoseconds).toBe(123n);
+    });
 });
 
 describe("errors", () => {

Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.from.js

@@ -17,6 +17,14 @@ describe("correct behavior", () => {
         expect(createdPlainDate.month).toBe(7);
         expect(createdPlainDate.day).toBe(26);
     });
+
+    test("ZonedDateTime instance argument", () => {
+        const zonedDateTime = new Temporal.ZonedDateTime(1627318123456789000n, "UTC");
+        const createdPlainDate = Temporal.PlainDate.from(zonedDateTime);
+        expect(createdPlainDate.year).toBe(2021);
+        expect(createdPlainDate.month).toBe(7);
+        expect(createdPlainDate.day).toBe(26);
+    });
 });
 
 describe("errors", () => {

Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.from.js

@@ -32,6 +32,20 @@ describe("correct behavior", () => {
         expect(plainDateTime.nanosecond).toBe(0);
     });
 
+    test("ZonedDateTime instance argument", () => {
+        const zonedDateTime = new Temporal.ZonedDateTime(1625614921000000000n, "UTC");
+        const plainDateTime = Temporal.PlainDateTime.from(zonedDateTime);
+        expect(plainDateTime.year).toBe(2021);
+        expect(plainDateTime.month).toBe(7);
+        expect(plainDateTime.day).toBe(6);
+        expect(plainDateTime.hour).toBe(23);
+        expect(plainDateTime.minute).toBe(42);
+        expect(plainDateTime.second).toBe(1);
+        expect(plainDateTime.millisecond).toBe(0);
+        expect(plainDateTime.microsecond).toBe(0);
+        expect(plainDateTime.nanosecond).toBe(0);
+    });
+
     test("fields object argument", () => {
         const object = {
             year: 2021,

Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.from.js

@@ -23,6 +23,17 @@ describe("correct behavior", () => {
         expect(createdPlainTime.microsecond).toBe(0);
         expect(createdPlainTime.nanosecond).toBe(0);
     });
+
+    test("ZonedDateTime instance argument", () => {
+        const zonedDateTime = new Temporal.ZonedDateTime(1627318123456789000n, "UTC");
+        const createdPlainTime = Temporal.PlainTime.from(zonedDateTime);
+        expect(createdPlainTime.hour).toBe(16);
+        expect(createdPlainTime.minute).toBe(48);
+        expect(createdPlainTime.second).toBe(43);
+        expect(createdPlainTime.millisecond).toBe(456);
+        expect(createdPlainTime.microsecond).toBe(789);
+        expect(createdPlainTime.nanosecond).toBe(0);
+    });
 });
 
 describe("errors", () => {