fix: dashboard editor run error (#1380)

dbgpt/util/date_utils.py

@@ -0,0 +1,11 @@
+import datetime
+
+
+def is_datetime(value):
+    return isinstance(value, datetime.datetime)
+
+
+def convert_datetime_in_row(row):
+    return [value.strftime('%Y-%m-%d %H:%M:%S') if is_datetime(value)
+            else value for value in row]
+