xe-utils/es/getDayOfYear.js

JavaScript 函数库、工具类

import getWhatYear from './getWhatYear'
import toStringDate from './toStringDate'

import isValidDate from './isValidDate'
import isLeapYear from './isLeapYear'

/**
  * 返回某个年份的天数
  *
  * @param {Date} date 日期或数字
  * @param {Number} offset 年(默认当年)、前几个年、后几个年
  * @return {Number}
  */
function getDayOfYear (date, offsetNum) {
  date = toStringDate(date)
  if (isValidDate(date)) {
    return isLeapYear(getWhatYear(date, offsetNum)) ? 366 : 365
  }
  return NaN
}

export default getDayOfYear