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40 lines
1.2 KiB
40 lines
1.2 KiB
var staticStrFirst = require('./staticStrFirst')
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var staticStrLast = require('./staticStrLast')
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var helperGetDateFullYear = require('./helperGetDateFullYear')
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var getWhatMonth = require('./getWhatMonth')
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var toStringDate = require('./toStringDate')
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var isValidDate = require('./isValidDate')
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/**
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* 返回前几年或后几年的日期
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*
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* @param {Date} date 日期或数字
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* @param {Number} offset 年(默认当前年)、前几个年(数值)、后几个年(数值)
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* @param {Number/String} month 获取哪月(null默认当前年)、年初(first)、年末(last)、指定月份（0-11）
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* @return {Date}
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*/
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function getWhatYear (date, offset, month) {
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var number
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date = toStringDate(date)
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if (isValidDate(date)) {
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if (offset) {
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number = offset && !isNaN(offset) ? offset : 0
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date.setFullYear(helperGetDateFullYear(date) + number)
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}
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if (month || !isNaN(month)) {
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if (month === staticStrFirst) {
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return new Date(helperGetDateFullYear(date), 0, 1)
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} else if (month === staticStrLast) {
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date.setMonth(11)
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return getWhatMonth(date, 0, staticStrLast)
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} else {
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date.setMonth(month)
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}
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}
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}
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return date
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}
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module.exports = getWhatYear
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