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

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+var staticStrFirst = require('./staticStrFirst')
+var staticStrLast = require('./staticStrLast')
+var staticParseInt = require('./staticParseInt')
+
+var helperGetDateFullYear = require('./helperGetDateFullYear')
+var helperGetDateMonth = require('./helperGetDateMonth')
+var helperGetDateTime = require('./helperGetDateTime')
+
+var toStringDate = require('./toStringDate')
+var isValidDate = require('./isValidDate')
+
+/**
+  * 返回前几天或后几天的日期
+  *
+  * @param {Date} date 日期或数字
+  * @param {Number} offset 天(默认当天)、前几天、后几天
+  * @param {String} mode 获取时分秒(null默认当前时分秒)、日初(first)、日末(last)
+  * @return {Date}
+  */
+function getWhatDay (date, offset, mode) {
+  date = toStringDate(date)
+  if (isValidDate(date) && !isNaN(offset)) {
+    date.setDate(date.getDate() + staticParseInt(offset))
+    if (mode === staticStrFirst) {
+      return new Date(helperGetDateFullYear(date), helperGetDateMonth(date), date.getDate())
+    } else if (mode === staticStrLast) {
+      return new Date(helperGetDateTime(getWhatDay(date, 1, staticStrFirst)) - 1)
+    }
+  }
+  return date
+}
+
+module.exports = getWhatDay