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Challenge 88: Weekday Finder

curriculum/challenges/english/blocks/daily-coding-challenges-javascript/68ee9e3066cfd4eb2328e8a7.md

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--description--

Given a string date in the format YYYY-MM-DD, return the day of the week.

Valid return days are:

  • "Sunday"
  • "Monday"
  • "Tuesday"
  • "Wednesday"
  • "Thursday"
  • "Friday"
  • "Saturday"

Be sure to ignore time zones.

--hints--

getWeekday("2025-11-06") should return Thursday.

js
assert.equal(getWeekday("2025-11-06"), "Thursday");

getWeekday("1999-12-31") should return Friday.

js
assert.equal(getWeekday("1999-12-31"), "Friday");

getWeekday("1111-11-11") should return Saturday.

js
assert.equal(getWeekday("1111-11-11"), "Saturday");

getWeekday("2112-12-21") should return Wednesday.

js
assert.equal(getWeekday("2112-12-21"), "Wednesday");

getWeekday("2345-10-01") should return Monday.

js
assert.equal(getWeekday("2345-10-01"), "Monday");

--seed--

--seed-contents--

js
function getWeekday(dateString) {

  return dateString;
}

--solutions--

js
function getWeekday(dateString) {
  const days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
  const [year, month, day] = dateString.split("-").map(Number);
  const date = new Date(Date.UTC(year, month - 1, day));

  return days[date.getUTCDay()];
}