#1507 - Reformat Date

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Problem Description

Given a date string in the form Day Month Year, where:

Day is in the set {"1st", "2nd", "3rd", "4th", ..., "30th", "31st"}.
Month is in the set {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}.
Year is in the range [1900, 2100].

Convert the date string to the format YYYY-MM-DD, where:

YYYY denotes the 4 digit year.
MM denotes the 2 digit month.
DD denotes the 2 digit day.

Solution

/**
 * @param {string} date
 * @return {string}
 */
var reformatDate = function(date) {
  const [_, day, month, year] = date.match(/(\d+)\w+\s+(\w+)\s+(\d+)/);
  return new Date(`${day} ${month} ${year}`).toISOString().split('T')[0];
};