자바스크립트 날짜 비교 함수

Posted on Edited on In , Word count in article: 137 Reading time ≈ 1 mins.

두 개의 입력된 날짜끼리 비교하는 함수를 정리해놔요

두개 날짜 사이의 일수

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const getNumDaysBetweenDates = (startDate, endDate) => {
  let dates = [];
  const date = new Date(startDate);
  while (date < endDate) {
    dates = [...dates, new Date(date)]
    date.setDate(date.getDate() + 1)    
  }
  return dates.length;
}

const start = new Date(2021, 1, 31);
const end = new Date(2021, 2, 2);
const result = getNumDaysBetweenDates(start, end);

날짜가 더 먼저인지

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const isBefore = (date1, date2) => {
  return (date1.setHours(0, 0, 0, 0) - date2.setHours(0, 0, 0, 0)) < 0
}

const start = new Date(2020, 2, 3);
const end = new Date(2021, 1, 2);
const result = isBefore(start, end);

같은 날짜인지

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const isSameDay = (date1, date2) => {
  return date1.getFullYear() === date2.getFullYear() &&
    date1.getMonth() === date2.getMonth() &&
    date1.getDate() === date2.getDate();
}
const start = new Date(2021, 3, 1);
const end = new Date(2021, 3, 1);
const result = isSameDay(end, start);

참고포스트

  • medium