提交初始版本，使用vant ui库

miniprogram_npm/@vant/weapp/calendar/utils.wxs

@@ -0,0 +1,25 @@
+/* eslint-disable */
+function getMonthEndDay(year, month) {
+  return 32 -  getDate(year, month - 1, 32).getDate();
+}
+
+function compareMonth(date1, date2) {
+  date1 = getDate(date1);
+  date2 = getDate(date2);
+
+  var year1 = date1.getFullYear();
+  var year2 = date2.getFullYear();
+  var month1 = date1.getMonth();
+  var month2 = date2.getMonth();
+
+  if (year1 === year2) {
+    return month1 === month2 ? 0 : month1 > month2 ? 1 : -1;
+  }
+
+  return year1 > year2 ? 1 : -1;
+}
+
+module.exports = {
+  getMonthEndDay: getMonthEndDay,
+  compareMonth: compareMonth
+};