Revert "make compilation fail"

This reverts commit 6dcb2ed.

Author: php-coder

src/main/java/ru/mystamps/web/service/CollectionService.java

@@ -17,6 +17,7 @@
  */
 package ru.mystamps.web.service;
 
+import java.util.Date;
 import java.util.List;
 
 import ru.mystamps.web.dao.dto.CollectionInfoDto;