date.js

export const getTodayArray = (calc = 0) => {
	const today = new Date();
	const calcTime = new Date(today.getFullYear(), today.getMonth(), today.getDate() + calc);
	const year = calcTime.getFullYear();
	const month = calcTime.getMonth() + 1;
	const day = calcTime.getDate();
	return [year, month, day];
};

export const getYearMonth = ({ day = 0, month = 0 } = {}) => {
	const today = getTodayArray();
	const currentTime = new Date(today[0], today[1] + month, today[2] + day);
	const newYear = currentTime.getFullYear();
	const newMonth = `0${currentTime.getMonth()}`.slice(-2);
	return `${newYear}-${newMonth}`;
};

export const getDay = () => `0${new Date().getDate()}`.slice(-2);

export const getCurrentMonthDate = (value) => {
	const month = value.substr(5, 2);
	const day = getDay();
	const dayStr = `(${month}/01~${day})`;
	return getYearMonth() === value ? dayStr : '';
};

export const getYesterdayMonthDate = () => {
	const yesterday = getTodayArray(-1);
	const month = yesterday[1];
	const day = yesterday[2];
	return `(${month}/01~${day})`;
};