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src/main/java/com/rj/service/HxrAdminUserService.java

@@ -64,6 +64,20 @@ public class HxrAdminUserService {
         return LocalDateTime.of(d, now.toLocalTime());
     }
 
+    /**
+     * VIP 到期时间：以 {@code applyDate} 为起算日顺延 {@code calendarDays} 个自然日，时刻与当前时分秒一致。
+     */
+    public static LocalDateTime computeVipExpireTimePlusCalendarDays(LocalDate applyDate, int calendarDays) {
+        if (applyDate == null) {
+            throw new IllegalArgumentException("applyDate不能为空");
+        }
+        if (calendarDays < 0) {
+            throw new IllegalArgumentException("calendarDays不能为负");
+        }
+        LocalDateTime now = LocalDateTime.now();
+        return LocalDateTime.of(applyDate.plusDays(calendarDays), now.toLocalTime());
+    }
+
     /**
      * 调用第三方接口
      * 按手机号查询用户列表，返回第一条。