Squashed 'engine262/' content from commit ae71998

git-subtree-dir: engine262
git-subtree-split: ae71998cc5a8315700555135b1ac202a0d6d0b31

src/abstract-ops/temporal/now.mts

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+import type { ISODateTimeRecord } from '../../intrinsics/Temporal/PlainDateTime.mts';
+import { SystemTimeZoneIdentifier } from './addition.mts';
+import { temporal_todo } from './not-implemented.mts';
+import {
+  ObjectValue, GetGlobalObject, Value, type PlainCompletion, Q, ToTemporalTimeZoneIdentifier, GetISODateTimeFor,
+} from '#self';
+
+/** https://tc39.es/proposal-temporal/#sec-hostsystemutcepochnanoseconds */
+export function HostSystemUTCEpochNanoseconds(_global: ObjectValue): number {
+  temporal_todo();
+}
+
+/** https://tc39.es/proposal-temporal/#sec-temporal-systemutcepochmilliseconds */
+export function SystemUTCEpochMilliseconds(): number {
+  const global = GetGlobalObject();
+  const nowNs = HostSystemUTCEpochNanoseconds(global);
+  return Math.floor(nowNs / (10 ** 6));
+}
+
+/** https://tc39.es/proposal-temporal/#sec-temporal-systemutcepochnanoseconds */
+export function SystemUTCEpochNanoseconds(): bigint {
+  const global = GetGlobalObject();
+  const nowNs = HostSystemUTCEpochNanoseconds(global);
+  return BigInt(nowNs);
+}
+
+/** https://tc39.es/proposal-temporal/#sec-temporal-systemdatetime */
+export function SystemDateTime(temporalTimeZoneLike: Value): PlainCompletion<ISODateTimeRecord> {
+  let timeZone;
+  if (temporalTimeZoneLike === Value.undefined) {
+    timeZone = SystemTimeZoneIdentifier();
+  } else {
+    timeZone = Q(ToTemporalTimeZoneIdentifier(temporalTimeZoneLike));
+  }
+  const epochNs = SystemUTCEpochNanoseconds();
+  return GetISODateTimeFor(timeZone, epochNs);
+}