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id, title, challengeType, dashedName
| id | title | challengeType | dashedName |
|---|---|---|---|
| 69f35a5bb823ed620fcb7cb9 | Challenge 280: Mongo ID Date | 28 | challenge-280 |
--description--
Given a MongoDB ID string, return its creation time as an ISO 8601 string.
- A MongoDB ID is a 24-character hex string. The first 8 characters represent a Unix timestamp (in seconds) encoded as a base-16 integer.
For example, "6a094b50bcf86cd799439011" has a timestamp of "6a094b50" in hex, which is 1778994000 in decimal, representing a creation time of "2026-05-17T05:00:00.000Z".
--hints--
mongoIdToDate("6a094b50bcf86cd799439011") should return "2026-05-17T05:00:00.000Z".
assert.equal(mongoIdToDate("6a094b50bcf86cd799439011"), "2026-05-17T05:00:00.000Z");
mongoIdToDate("695344eb1f4a4c1123042128") should return "2025-12-30T03:20:11.000Z".
assert.equal(mongoIdToDate("695344eb1f4a4c1123042128"), "2025-12-30T03:20:11.000Z");
mongoIdToDate("386da62df34123ac54617e56") should return "2000-01-01T07:01:01.000Z".
assert.equal(mongoIdToDate("386da62df34123ac54617e56"), "2000-01-01T07:01:01.000Z");
mongoIdToDate("69f571c3d7711807afd3dd55") should return "2026-05-02T03:38:43.000Z".
assert.equal(mongoIdToDate("69f571c3d7711807afd3dd55"), "2026-05-02T03:38:43.000Z");
mongoIdToDate("68adce01c0e1144d0a90295a") should return "2025-08-26T15:08:49.000Z".
assert.equal(mongoIdToDate("68adce01c0e1144d0a90295a"), "2025-08-26T15:08:49.000Z");
--seed--
--seed-contents--
function mongoIdToDate(id) {
return id;
}
--solutions--
function mongoIdToDate(id) {
const timestamp = parseInt(id.slice(0, 8), 16);
return new Date(timestamp * 1000).toISOString();
}