diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetFormInstanceModelCmd.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetFormInstanceModelCmd.java
index ed8089fd9..d81e50f59 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetFormInstanceModelCmd.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetFormInstanceModelCmd.java
@@ -130,7 +130,7 @@ public class CustomGetFormInstanceModelCmd extends GetFormInstanceModelCmd {
                 try {
                     if (org.apache.commons.lang3.StringUtils.isNotEmpty(fieldValue)) {
                         LocalDate dateValue = LocalDate.parse(fieldValue);
-                        variables.put(field.getId(), dateValue.toString(field.getParam("fmt").toString()));
+                        variables.put(field.getId(), dateValue.toString(fmtConvert(field.getParam("fmt").toString())));
                     }
                 } catch (Exception e) {
                     log.error("Error parsing form date value for process instance {} and task {} with value {}", processInstanceId, taskId, fieldValue, e);
@@ -378,7 +378,7 @@ public class CustomGetFormInstanceModelCmd extends GetFormInstanceModelCmd {
                     if (variableValue != null) {
 
                         if (variableValue instanceof LocalDate) {
-                            field.setValue(((LocalDate) variableValue).toString(field.getParam("fmt").toString()));
+                            field.setValue(((LocalDate) variableValue).toString(fmtConvert(field.getParam("fmt").toString())));
                         } else if (variableValue instanceof Date) {
                             field.setValue(DATE_FORMAT.format(((Date) variableValue).toInstant()));
                         } else {
@@ -391,4 +391,15 @@ public class CustomGetFormInstanceModelCmd extends GetFormInstanceModelCmd {
             }
         }
     }
+
+    private String fmtConvert(String fmt) {
+        switch (fmt) {
+            case "YYYY-MM-DD HH:mm:ss":
+                return "yyyy-MM-dd HH:mm:ss";
+            case "YYYY-MM-DD HH:mm":
+                return "yyyy-MM-dd HH:mm";
+            default:
+                return "yyyy-MM-dd";
+        }
+    }
 }