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20220330_Vote/Ewide.Web.Entry/wwwroot/lib/xe-utils/getDayOfYear.js

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+var getWhatYear = require('./getWhatYear')
+var toStringDate = require('./toStringDate')
+
+var isValidDate = require('./isValidDate')
+var isLeapYear = require('./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, year) {
+  date = toStringDate(date)
+  if (isValidDate(date)) {
+    return isLeapYear(getWhatYear(date, year)) ? 366 : 365
+  }
+  return NaN
+}
+
+module.exports = getDayOfYear