活动导入时间格式优化

app/Imports/EventCalendarImport.php

@@ -71,6 +71,7 @@ class EventCalendarImport implements ToModel
             $this->error[] = imports_error($this->index, 'import7');
             return ;
         }
+        $start_time = $this->excelToDateTime($start_time);
         $start_times = strtotime($start_time);
         if (!$start_times) {
             $this->error[] = imports_error($this->index, 'import8');
@@ -90,6 +91,7 @@ class EventCalendarImport implements ToModel
             $this->error[] = imports_error($this->index, 'import11');
             return ;
         }
+        $end_time = $this->excelToDateTime($end_time);
         $end_times = strtotime($end_time);
         if (!$end_times) {
             $this->error[] = imports_error($this->index, 'import12');