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Challenge 109: What's My Age Again?

curriculum/challenges/english/blocks/daily-coding-challenges-python/68ffb91507a5b645769328cc.md

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--description--

Given the date of someone's birthday in the format YYYY-MM-DD, return the person's age as of November 27th, 2025.

  • Assume all birthdays are valid dates before November 27th, 2025.
  • Return the age as an integer.
  • Be sure to account for whether the person has already had their birthday in 2025.

--hints--

calculate_age("2000-11-20") should return 25.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(calculate_age("2000-11-20"), 25)`)
}})

calculate_age("2000-12-01") should return 24.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(calculate_age("2000-12-01"), 24)`)
}})

calculate_age("2014-10-25") should return 11.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(calculate_age("2014-10-25"), 11)`)
}})

calculate_age("1994-01-06") should return 31.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(calculate_age("1994-01-06"), 31)`)
}})

calculate_age("1994-12-14") should return 30.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(calculate_age("1994-12-14"), 30)`)
}})

--seed--

--seed-contents--

py
def calculate_age(birthday):

    return birthday

--solutions--

py
from datetime import datetime
def calculate_age(birthday):
    today = datetime(2025, 11, 27)
    birth_date = datetime.strptime(birthday, "%Y-%m-%d")

    age = today.year - birth_date.year

    if (today.month, today.day) < (birth_date.month, birth_date.day):
        age -= 1

    return age