39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
var getWhatMonth = require('./getWhatMonth')
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var toStringDate = require('./toStringDate')
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var isValidDate = require('./isValidDate')
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function getQuarterNumber (date) {
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var month = date.getMonth()
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if (month < 3) {
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return 1
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} else if (month < 6) {
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return 2
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} else if (month < 9) {
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return 3
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}
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return 4
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}
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/**
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* 返回前几季度或后几季度的日期
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*
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* @param {Date} date 日期
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* @param {Number} offset 季度(默认当前季度)、前几季度、后几季度
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* @param {Number} day 获取哪天：月初(first)、月末(last)、指定天数(数值)，如果为空，但超过指定月份的天数时，则默认单月最后一天
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* @return {Date}
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*/
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function getWhatQuarter (date, offset, day) {
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var currMonth, monthOffset = offset && !isNaN(offset) ? offset * 3 : 0
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date = toStringDate(date)
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if (isValidDate(date)) {
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currMonth = (getQuarterNumber(date) - 1) * 3
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date.setMonth(currMonth)
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return getWhatMonth(date, monthOffset, day)
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}
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return date
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}
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module.exports = getWhatQuarter
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