28 lines
855 B
JavaScript
28 lines
855 B
JavaScript
var staticDayTime = require('./staticDayTime')
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var staticStrFirst = require('./staticStrFirst')
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var staticStrLast = require('./staticStrLast')
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var helperGetDateTime = require('./helperGetDateTime')
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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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* 返回某个月份的天数
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*
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* @param {Date} date 日期或数字
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* @param {Number} offset 月(默认当月)、前几个月、后几个月
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* @return {Number}
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*/
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function getDayOfMonth (date, month) {
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date = toStringDate(date)
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if (isValidDate(date)) {
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return Math.floor((helperGetDateTime(getWhatMonth(date, month, staticStrLast)) - helperGetDateTime(getWhatMonth(date, month, staticStrFirst))) / staticDayTime) + 1
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}
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return NaN
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}
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module.exports = getDayOfMonth
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