update

app/Models/CourseSign.php

@@ -186,7 +186,6 @@ class CourseSign extends SoftDeletesModel
             $query->whereIn('id', $userIds);
         })->where('is_yh_invested', 1)->get();
         // 自定义时间：需要按被投时间筛选
-        $startDate = substr($start_date, 0, 10);
         $endDate = substr($end_date, 0, 10);
         // 筛选出被投时间在范围内的企业
         $filteredCompanies = [];
@@ -195,7 +194,7 @@ class CourseSign extends SoftDeletesModel
             foreach ($projectUsers as $item) {
                 $investDate = $item['investDate'] ?? null;
                 // 检查被投时间是否在范围内
-                if ($investDate && $investDate >= $startDate && $investDate <= $endDate) {
+                if ($investDate && $investDate <= $endDate) {
                     $filteredCompanies[] = $company;
                     break; // 只要有一条满足就加入
                 }