JSTests/test262/test/built-ins/Temporal/ZonedDateTime/prototype/toString/year-format.js

// Copyright (C) 2022 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-temporal.zoneddatetime.prototype.tostring
description: Verify that the year is appropriately formatted as 4 or 6 digits
features: [Temporal]
---*/

function epochNsInYear(year) {
  // Return an epoch nanoseconds value near the middle of the given year
  const avgNsPerYear = 31_556_952_000_000_000n;
  return (year - 1970n) * avgNsPerYear + (avgNsPerYear / 2n);
}

const utc = new Temporal.TimeZone("UTC");

let instance = new Temporal.ZonedDateTime(epochNsInYear(-100000n), utc);
assert.sameValue(instance.toString(), "-100000-07-01T21:30:36+00:00[UTC]", "large negative year formatted as 6-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(-10000n), utc);
assert.sameValue(instance.toString(), "-010000-07-01T21:30:36+00:00[UTC]", "smallest 5-digit negative year formatted as 6-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(-9999n), utc);
assert.sameValue(instance.toString(), "-009999-07-02T03:19:48+00:00[UTC]", "largest 4-digit negative year formatted as 6-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(-1000n), utc);
assert.sameValue(instance.toString(), "-001000-07-02T09:30:36+00:00[UTC]", "smallest 4-digit negative year formatted as 6-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(-999n), utc);
assert.sameValue(instance.toString(), "-000999-07-02T15:19:48+00:00[UTC]", "largest 3-digit negative year formatted as 6-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(-1n), utc);
assert.sameValue(instance.toString(), "-000001-07-02T15:41:24+00:00[UTC]", "year -1 formatted as 6-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(0n), utc);
assert.sameValue(instance.toString(), "0000-07-01T21:30:36+00:00[UTC]", "year 0 formatted as 4-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(1n), utc);
assert.sameValue(instance.toString(), "0001-07-02T03:19:48+00:00[UTC]", "year 1 formatted as 4-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(999n), utc);
assert.sameValue(instance.toString(), "0999-07-02T03:41:24+00:00[UTC]", "largest 3-digit positive year formatted as 4-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(1000n), utc);
assert.sameValue(instance.toString(), "1000-07-02T09:30:36+00:00[UTC]", "smallest 4-digit positive year formatted as 4-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(9999n), utc);
assert.sameValue(instance.toString(), "9999-07-02T15:41:24+00:00[UTC]", "largest 4-digit positive year formatted as 4-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(10000n), utc);
assert.sameValue(instance.toString(), "+010000-07-01T21:30:36+00:00[UTC]", "smallest 5-digit positive year formatted as 6-digit");

instance = new Temporal.ZonedDateTime(epochNsInYear(100000n), utc);
assert.sameValue(instance.toString(), "+100000-07-01T21:30:36+00:00[UTC]", "large positive year formatted as 6-digit");