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70 lines
1.7 KiB
Markdown
70 lines
1.7 KiB
Markdown
---
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id: 69a890af247de743333bd4d0
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title: "Challenge 227: Cooldown Time"
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challengeType: 28
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dashedName: challenge-227
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---
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# --description--
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Given two timestamps, the first representing when a user finished an exam, and the second representing the current time, determine whether the user can take an exam again.
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- Both timestamps will be given the format: `"YYYY-MM-DDTHH:MM:SS"`, for example `"2026-03-25T14:00:00"`. Note that the time is 24-hour clock.
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- A user must wait at least 48 hours before retaking an exam.
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# --hints--
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`canRetake("2026-03-23T08:00:00", "2026-03-25T14:00:00")` should return `true`.
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```js
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assert.isTrue(canRetake("2026-03-23T08:00:00", "2026-03-25T14:00:00"));
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```
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`canRetake("2026-03-24T14:00:00", "2026-03-25T10:00:00")` should return `false`.
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```js
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assert.isFalse(canRetake("2026-03-24T14:00:00", "2026-03-25T10:00:00"));
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```
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`canRetake("2026-03-23T09:25:00", "2026-03-25T09:25:00")` should return `true`.
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```js
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assert.isTrue(canRetake("2026-03-23T09:25:00", "2026-03-25T09:25:00"));
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```
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`canRetake("2026-03-23T11:50:00", "2026-03-25T11:49:59")` should return `false`.
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```js
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assert.isFalse(canRetake("2026-03-23T11:50:00", "2026-03-25T11:49:59"));
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```
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# --seed--
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## --seed-contents--
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```js
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function canRetake(finishTime, currentTime) {
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return finishTime;
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}
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```
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# --solutions--
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```js
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function canRetake(finishTime, currentTime) {
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function parse(ts) {
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const parts = ts.split(/[-T:]/).map(Number);
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const [y, m, d, h, min, s] = parts;
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return Date.UTC(y, m - 1, d, h, min, s);
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}
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const finishMs = parse(finishTime);
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const currentMs = parse(currentTime);
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const cooldown = 48 * 60 * 60 * 1000;
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return currentMs - finishMs >= cooldown;
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}
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```
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