Merge pull request #3788 from SukkaW/drop-lodash-for-date-helper

refactor(date_helper): drop lodash

Author: segayuu

lib/plugins/helper/date.js

@@ -2,7 +2,13 @@
 
 const moment = require('moment-timezone');
 const { isMoment } = moment;
-const isDate = require('lodash/isDate');
+
+const isDate = (value) => {
+  if (typeof value === 'object') {
+    if (value instanceof Date) return !isNaN(value.getTime());
+  }
+  return false;
+};
 
 function getMoment(date, lang, timezone) {
   if (date == null) date = moment();