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116 lines
2.8 KiB
Markdown
116 lines
2.8 KiB
Markdown
---
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id: 6a2037a68a0bc2aef0006003
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title: "Challenge 341: Birthday Countdown"
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challengeType: 29
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dashedName: challenge-341
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---
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# --description--
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Given today's date and a birthday, return the number of days until the person's next birthday.
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- Today's date is given as a string in `"YYYY-MM-DD"` format, with leading zeros, for example: `"2026-07-16"`.
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- The birthday is given as a string in `"M/D"` format, without leading zeros, for example: `"9/7"`.
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- If today is their birthday, return the number of days until their next birthday (not `0`).
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- Leap years should be accounted for.
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# --hints--
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`days_until_birthday("2026-07-16", "9/7")` should return `53`.
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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(days_until_birthday("2026-07-16", "9/7"), 53)`)
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}})
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```
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`days_until_birthday("2026-07-16", "3/22")` should return `249`.
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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(days_until_birthday("2026-07-16", "3/22"), 249)`)
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}})
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```
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`days_until_birthday("2026-07-16", "7/16")` should return `365`.
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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(days_until_birthday("2026-07-16", "7/16"), 365)`)
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}})
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```
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`days_until_birthday("2024-02-28", "3/1")` should return `2`.
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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(days_until_birthday("2024-02-28", "3/1"), 2)`)
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}})
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```
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`days_until_birthday("2023-04-24", "12/30")` should return `250`.
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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(days_until_birthday("2023-04-24", "12/30"), 250)`)
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}})
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```
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`days_until_birthday("2024-03-01", "2/29")` should return `1460`.
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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(days_until_birthday("2024-03-01", "2/29"), 1460)`)
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}})
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```
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`days_until_birthday("2096-03-01", "2/29")` should return `2920`.
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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(days_until_birthday("2096-03-01", "2/29"), 2920)`)
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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 days_until_birthday(today, birthday):
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return today
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```
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# --solutions--
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```py
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def days_until_birthday(today, birthday):
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from datetime import date
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year, month, day = [int(x) for x in today.split("-")]
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b_month, b_day = [int(x) for x in birthday.split("/")]
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today_date = date(year, month, day)
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def is_leap_year(y):
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return (y % 4 == 0 and y % 100 != 0) or y % 400 == 0
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def next_valid_birthday(from_year):
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for y in range(from_year, from_year + 9):
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if b_month == 2 and b_day == 29 and not is_leap_year(y):
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continue
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d = date(y, b_month, b_day)
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if d > today_date:
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return d
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return (next_valid_birthday(year) - today_date).days
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```
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