DatePicker: fix disabled dates for the west hemisphere

packages/date-picker/src/basic/month-table.vue

@@ -67,7 +67,7 @@
         var year = this.date.getFullYear();
         var date = new Date(0);
         date.setFullYear(year);
-        date.setMonth(month);
+        date.setMonth(month, 1);
         date.setHours(0);
         var nextMonth = new Date(date);
         nextMonth.setMonth(month + 1);

packages/date-picker/src/basic/year-table.vue

@@ -63,9 +63,7 @@
       getCellStyle(year) {
         const style = {};
 
-        var date = new Date(0);
-        date.setFullYear(year);
-        date.setHours(0);
+        var date = new Date(year, 0, 1, 0);
         var nextYear = new Date(date);
         nextYear.setFullYear(year + 1);