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Challenge 118: Date Formatter

curriculum/challenges/english/blocks/daily-coding-challenges-javascript/69162d64f96574d9bb629f03.md

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--description--

Given a date in the format "Month day, year", return the date in the format "YYYY-MM-DD".

  • The given month will be the full English month name. For example: "January", "February", etc.
  • In the return value, pad the month and day with leading zeros if necessary to ensure two digits.

For example, given "December 6, 2025", return "2025-12-06".

--hints--

formatDate("December 6, 2025") should return "2025-12-06".

js
assert.equal(formatDate("December 6, 2025"), "2025-12-06");

formatDate("January 1, 2000") should return "2000-01-01".

js
assert.equal(formatDate("January 1, 2000"), "2000-01-01");

formatDate("November 11, 1111") should return "1111-11-11".

js
assert.equal(formatDate("November 11, 1111"), "1111-11-11");

formatDate("September 7, 512") should return "512-09-07".

js
assert.equal(formatDate("September 7, 512"), "512-09-07");

formatDate("May 4, 1950") should return "1950-05-04".

js
assert.equal(formatDate("May 4, 1950"), "1950-05-04");

formatDate("February 29, 1992") should return "1992-02-29".

js
assert.equal(formatDate("February 29, 1992"), "1992-02-29");

--seed--

--seed-contents--

js
function formatDate(dateString) {

  return dateString;
}

--solutions--

js
function formatDate(dateString) {
  const months = {
    January: "01",
    February: "02",
    March: "03",
    April: "04",
    May: "05",
    June: "06",
    July: "07",
    August: "08",
    September: "09",
    October: "10",
    November: "11",
    December: "12"
  };

  const [month, day, year] = dateString.replace(",", "").split(" ");

  return `${year}-${months[month]}-${day.padStart(2, "0")}`;
}