freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/rosetta-code/discordian-date.md

id, title, challengeType, videoUrl, dashedName

id	title	challengeType	videoUrl	dashedName
59f4eafba0343628bb682785	Discordian日期	5		discordian-date

--description--

任务：

将给定日期从公历转换为Discordian日历 。

--hints--

discordianDate是一个函数。

assert(typeof discordianDate === 'function');

discordianDate(new Date(2010, 6, 22)) "Pungenday, the 57th day of Confusion in the YOLD 3176" discordianDate(new Date(2010, 6, 22))应该返回"Pungenday, the 57th day of Confusion in the YOLD 3176" 。

assert(
  discordianDate(new Date(2010, 6, 22)) ===
    'Pungenday, the 57th day of Confusion in the YOLD 3176'
);

discordianDate(new Date(2012, 1, 28))应该返回"Prickle-Prickle, the 59th day of Chaos in the YOLD 3178" 。

assert(
  discordianDate(new Date(2012, 1, 28)) ===
    'Prickle-Prickle, the 59th day of Chaos in the YOLD 3178'
);

discordianDate(new Date(2012, 1, 29)) "Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib's Day!" discordianDate(new Date(2012, 1, 29))应该返回"Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib's Day!" 。

assert(
  discordianDate(new Date(2012, 1, 29)) ===
    "Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib's Day!"
);

discordianDate(new Date(2012, 2, 1))应该返回"Setting Orange, the 60th day of Chaos in the YOLD 3178" 。

assert(
  discordianDate(new Date(2012, 2, 1)) ===
    'Setting Orange, the 60th day of Chaos in the YOLD 3178'
);

discordianDate(new Date(2010, 0, 5)) "Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!" discordianDate(new Date(2010, 0, 5))应该返回"Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!" 。

assert(
  discordianDate(new Date(2010, 0, 5)) ===
    'Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!'
);

discordianDate(new Date(2011, 4, 3))应该返回"Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!" 。

assert(
  discordianDate(new Date(2011, 4, 3)) ===
    'Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!'
);

discordianDate(new Date(2015, 9, 19)) "Boomtime, the 73rd day of Bureaucracy in the YOLD 3181" discordianDate(new Date(2015, 9, 19))应该返回"Boomtime, the 73rd day of Bureaucracy in the YOLD 3181" 。

assert(
  discordianDate(new Date(2015, 9, 19)) ===
    'Boomtime, the 73rd day of Bureaucracy in the YOLD 3181'
);

--seed--

--seed-contents--

function discordianDate(date) {

  return true;
}

--solutions--

/**
 * All Hail Discordia! - this script prints Discordian date using system date.
 *
 * lang: JavaScript
 * author: jklu
 * contributors: JamesMcGuigan
 *
 * source: https://rosettacode.org/wiki/Discordian_date#JavaScript
 */
const seasons = [
  'Chaos', 'Discord', 'Confusion',
  'Bureaucracy', 'The Aftermath'
];
const weekday = [
  'Sweetmorn', 'Boomtime', 'Pungenday',
  'Prickle-Prickle', 'Setting Orange'
];

const apostle = [
  'Mungday', 'Mojoday', 'Syaday',
  'Zaraday', 'Maladay'
];

const holiday = [
  'Chaoflux', 'Discoflux', 'Confuflux',
  'Bureflux', 'Afflux'
];


Date.prototype.isLeapYear = function() {
  const year = this.getFullYear();
  if ((year & 3) !== 0) { return false; }
  return ((year % 100) !== 0 || (year % 400) === 0);
};

// Get Day of Year
Date.prototype.getDOY = function() {
  const dayCount = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
  const mn = this.getMonth();
  const dn = this.getDate();
  let dayOfYear = dayCount[mn] + dn;
  if (mn > 1 && this.isLeapYear()) { dayOfYear += 1; }
  return dayOfYear;
};

Date.prototype.isToday = function() {
  const today = new Date();
  return this.getDate() === today.getDate()
      && this.getMonth() === today.getMonth()
      && this.getFullYear() === today.getFullYear()
  ;
};

function discordianDate(date) {
  if (!date) { date = new Date(); }

  const y = date.getFullYear();
  const yold = y + 1166;
  let dayOfYear = date.getDOY();
  let celebrateHoliday = null;

  if (date.isLeapYear()) {
    if (dayOfYear === 60) {
      celebrateHoliday = 'St. Tib\'s Day';
    }
    else if (dayOfYear > 60) {
      dayOfYear--;
    }
  }
  dayOfYear--;

  const divDay = Math.floor(dayOfYear / 73);

  const seasonDay = (dayOfYear % 73) + 1;
  if (seasonDay === 5) {
    celebrateHoliday = apostle[divDay];
  }
  if (seasonDay === 50) {
    celebrateHoliday = holiday[divDay];
  }

  const season = seasons[divDay];
  const dayOfWeek = weekday[dayOfYear % 5];

  const nth = (seasonDay % 10 === 1) ? 'st'
          : (seasonDay % 10 === 2) ? 'nd'
          : (seasonDay % 10 === 3) ? 'rd'
                                  : 'th';

  return ''
         + dayOfWeek
         + ', the ' + seasonDay + nth
         + ' day of ' + season
         + ' in the YOLD ' + yold
         + (celebrateHoliday ? '. Celebrate ' + celebrateHoliday + '!' : '')
    ;
}