[JS] Operations with Dates, Intl, setTimeout, setInterval

hoje15v·2021년 12월 21일
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JavaScript

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강의 출처 : The Complete JavaScript Course 2022 Jonas (Udemy)

Creating Dates

new Date()

const now = new Date();
console.log(now);
//Tue Dec 21 2021 14:39:36 GMT+0900 (한국 표준시)
console.log(new Date('Tue Dec 21 2021 14:39:07'));
//Tue Dec 21 2021 14:39:07 GMT+0900 (한국 표준시)
console.log(new Date('December 24, 2015'));
//Thu Dec 24 2015 00:00:00 GMT+0900 (한국 표준시)
console.log(new Date(account1.movementsDates[0]));
//Tue Nov 19 2019 06:31:17 GMT+0900 (한국 표준시)

console.log(new Date(2037, 10, 19, 15, 23, 5));
//Thu Nov 19 2037 15:23:05 GMT+0900 (한국 표준시)
// 10 -> Nov Month in JS is 0 based.
console.log(new Date(2037, 10, 33));
//Thu Dec 03 2037 00:00:00 GMT+0900 (한국 표준시)
//자동으로 다음달로 넘어가줌.

console.log(new Date(0));
//Thu Jan 01 1970 09:00:00 GMT+0900 (한국 표준시)
console.log(new Date(3 * 24 * 60 * 60 * 1000));
//Sun Jan 04 1970 09:00:00 GMT+0900 (한국 표준시)
// 3일 뒤 => 3일 * 24시간 * 60분 * 60초 * 1000(milli secon로 바꾸기)
//3 * 24 * 60 * 60 * 1000 = 259200000 이 숫자를 1970년 1월1일로부터의 3일 뒤의 timestamp라고 부른다.

Working with dates

const future = new Date(2037, 10, 19, 15, 23);
console.log(future);
console.log(future.getFullYear()); //2037 주의) getYear()이 아닌 getFullYear()이용할 것!
console.log(future.getMonth()); //10
console.log(future.getDate()); //19
console.log(future.getDay()); //4
console.log(future.getHours()); //15
console.log(future.getMinutes()); //23
console.log(future.getSeconds()); //0
console.log(future.toISOString()); 
//2037-11-19T06:23:00.000Z
console.log(future.getTime()); //2142224580000 1970년 1월1일로부터의 timestamp

console.log(new Date(2142224580000)); //Thu Nov 19 2037 15:23:00 GMT+0900 (한국 표준시)

console.log(Date.now()); //1640066023880 지금 당장의 timestamp를 제공한다.

future.setFullYear(2040);
console.log(future); //Mon Nov 19 2040 15:23:00 GMT+0900 (한국 표준시)

ex)

const formatMovementDate = function(date){
  const day = `${date.getDate()}`.padStart(2, 0);
  const month = `${date.getMonth() + 1}`.padStart(2, 0);
  const year = date.getFullYear();
  return `${day}/${month}/${year}`;}
  
 const displayMovements = function (acc, movements, sort = false) {
  const movs = sort
    ? acc.movements.slice().sort((a, b) => a - b)
    : acc.movements;

  movs.forEach(function (mov, i) {
    const date = new Date(acc.movementsDates[i]);
    const displayDate = formatMovementDate(date);
    
      const html = `<div class="movements__date">${displayDate}</div>
    `;

    containerMovements.insertAdjacentHTML('afterbegin', html);
  });
}; 
  
 

유의할 점) padStart는 문자열 뒤에만 쓰일 수 있으니 template literal등의 string 표기 해줄 것!

Operations With Dates

const future = new Date(2037, 10, 19, 15, 23);
console.log(+future); //2142224580000
console.log(future); //Thu Nov 19 2037 15:23:00 GMT+0900 (한국 표준시

const calcDaysPassed = (date1, date2) =>
  Math.abs(date2 - date1) / (1000 * 60 * 60 * 24);

const days1 = calcDaysPassed(new Date(2037, 3, 4), new Date(2037, 3, 14));
console.log(days1); //10 (days)

ex)

const formatMovementDate = function (date){ 
const calcDaysPassed = (date1, date2) =>
    Math.round(Math.abs(date2 - date1) / (1000 * 60 * 60 * 24));

  const daysPassed = calcDaysPassed(new Date(), date);

  if (daysPassed === 0) return 'Today';
  if (daysPassed === 1) return 'Yesterday';
  if (daysPassed <= 7) return `${daysPassed} days ago`; }
 

Internationalizing Dates (Intl)

Intl.DateTimeFormat

Intl.DateTimeFormat에는 locale string을 전달한다.
ex) ja-JP, en-UK 더 많은 정보는 iso language code table - Lingoes검색!

const now = new Date();
const options = {
  hour: 'numeric',
  minute: 'numeric',
  day: 'numeric',
  month: 'long',
  year: 'numeric',
  weekday: 'short',
};
const locale = navigator.language;
console.log(locale); //ko-KR

labelDate.textContent = new Intl.DateTimeFormat(locale, options).format(now);

Internationalizing Numbers (Intl)

Intl.NumberFormat

const num = 345235435.23;

const options = {
  style: 'currency', // ex) 'percent' 'decimal'
  //unit: 'mile-per-hour', //ex) 'celsius',
  currency: 'EUR',
  //useGrouping: false,
};

console.log('US :', new Intl.NumberFormat('en-US', options).format(num));
// US :  €345,235,435.23
console.log('Germany :', new Intl.NumberFormat('de-DE', options).format(num));
//Germany : 345.235.435,23 €
console.log('Syria :', new Intl.NumberFormat('ar-SY', options).format(num));
//Syria : ٣٤٥٬٢٣٥٬٤٣٥٫٢٣ €
console.log('Korea :', new Intl.NumberFormat('ko-KR', options).format(num));
//Korea :  €345,235,435.23
console.log(
  navigator.language,
  new Intl.NumberFormat(navigator.language, options).format(num)
);
//ko-KR  €345,235,435.23

ex)

const formatMovementDate = function (date, locale) {
return new Intl.DateTimeFormat(locale).format(date);}

const formatCur = function (value, locale, currency) {
  return new Intl.NumberFormat(locale, {
    style: 'currency',
    currency: currency,
  }).format(value);
};

const displayMovements = function (acc, movements, sort = false) {
  movs.forEach(function (mov, i) {
    const type = mov > 0 ? 'deposit' : 'withdrawal';

    const date = new Date(acc.movementsDates[i]);
    const displayDate = formatMovementDate(date, acc.locale);

    const formattedMov = formatCur(mov, acc.locale, acc.currency);
    
const html = `<div class="movements__date">${displayDate}</div>
        <div class="movements__value">${formattedMov}</div>
      </div>
    `;

containerMovements.insertAdjacentHTML('afterbegin', html);
  });
};

btnLogin.addEventListener('click', function (e) {
// Create Current Date and Time
    const now = new Date();
    const options = {
      hour: 'numeric',
      minute: 'numeric',
      day: 'numeric',
      month: 'numeric',
      year: 'numeric',
      //weekday: 'short',
    };
    
    labelDate.textContent = new Intl.DateTimeFormat(
      currentAccount.locale,
      options
    ).format(now);}

Timers: setTimeout and setInterval

setTimeout

const ingredients = ['olives', 'spinach'];
const pizzaTimer = setTimeout(
  (ing1, ing2) => console.log(`Here is your pizza with ${ing1} and ${ing2}`),
  3000,
  ...ingredients
);
console.log('Waiting...');
//Waiting
//Here is your pizza with olives and spinach
// setTimout의 세번째 인자 값들이 setTimeout callback함수의 매개변수 값임...!

if (ingredients.includes('spinach')) clearTimeout(pizzaTimer);
//pizzaTimer is not working

setInterval

 setInterval(function () {
   const now = new Date();
   console.log(now);
 }, 1000);

Implementing a Countdown Timer

let timer;
const startLogOutTimer = function () {
  const tick = function () {
    const min = `${Math.floor(time / 60)}`.padStart(2, 0);
    const second = `${time % 60}`.padStart(2, 0);
    // In each call, print the remaining time to UI
    labelTimer.textContent = `${min}:${second}`;

    // When 0 seconds, stop timer and log out user
    if (time === 0) {
      clearInterval(timer);
      labelWelcome.textContent = `Log in to get started`;
      containerApp.style.opacity = 0;
    }

    // Decrease 1S
    time--;
  };

  // Set time to 5 minutes
  let time = 120;
  // Call the timer every seconds
  tick();
  const timer = setInterval(tick, 1000);
  return timer;
};


btnLogin.addEventListener('click', function (e) {
if (timer) clearInterval(timer); // 두 timer가 중복되어 작동하지 않도록!
    timer = startLogOutTimer(); })

btnTransfer.addEventListener('click', function (e) {
// Reset Timer
    clearInterval(timer);
    timer = startLogOutTimer();}
    
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