add default publish date

src/main/java/com/zzsn/knowbase/service/impl/KnowledgeServiceImpl.java

@@ -90,6 +90,10 @@ class KnowledgeServiceImpl implements IKnowledgeService {
             knowledge.setVerifyStatus(0);
         }
         knowledge.setCreateTime(cn.hutool.core.date.DateUtil.formatDateTime(new Date()).replace(" ", "T"));
+        if(null==knowledge.getPublishDate()){
+            knowledge.setPublishDate(cn.hutool.core.date.DateUtil.formatDateTime(new Date()).replace(" ", "T"));
+        }
+
         knowledge.setDeleteFlag(0);
         KnowledgeMessage knowledgeMessage = new KnowledgeMessage();
         if (Integer.valueOf("0").equals(knowledge.getImportData())) {