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83 lines
2.1 KiB
Markdown
83 lines
2.1 KiB
Markdown
---
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id: 69f35a5bb823ed620fcb7cb9
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title: "Challenge 280: Mongo ID Date"
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challengeType: 29
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dashedName: challenge-280
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---
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# --description--
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Given a MongoDB ID string, return its creation time as an ISO 8601 string.
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- 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.
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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"`.
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# --hints--
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`mongo_id_to_date("6a094b50bcf86cd799439011")` should return `"2026-05-17T05:00:00.000Z"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(mongo_id_to_date("6a094b50bcf86cd799439011"), "2026-05-17T05:00:00.000Z")`)
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}})
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```
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`mongo_id_to_date("695344eb1f4a4c1123042128")` should return `"2025-12-30T03:20:11.000Z"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(mongo_id_to_date("695344eb1f4a4c1123042128"), "2025-12-30T03:20:11.000Z")`)
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}})
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```
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`mongo_id_to_date("386da62df34123ac54617e56")` should return `"2000-01-01T07:01:01.000Z"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(mongo_id_to_date("386da62df34123ac54617e56"), "2000-01-01T07:01:01.000Z")`)
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}})
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```
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`mongo_id_to_date("69f571c3d7711807afd3dd55")` should return `"2026-05-02T03:38:43.000Z"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(mongo_id_to_date("69f571c3d7711807afd3dd55"), "2026-05-02T03:38:43.000Z")`)
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}})
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```
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`mongo_id_to_date("68adce01c0e1144d0a90295a")` should return `"2025-08-26T15:08:49.000Z"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(mongo_id_to_date("68adce01c0e1144d0a90295a"), "2025-08-26T15:08:49.000Z")`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def mongo_id_to_date(s):
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return s
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```
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# --solutions--
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```py
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from datetime import datetime, timezone
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def mongo_id_to_date(s):
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timestamp = int(s[:8], 16)
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dt = datetime.fromtimestamp(timestamp, tz=timezone.utc)
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return dt.strftime("%Y-%m-%dT%H:%M:%S.000Z")
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```
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