MAINT: properly convert timestamp to string

src/caosadvancedtools/crawler.py

@@ -37,6 +37,7 @@ match. This occurs in basically three steps:
 
 
 import traceback
+from datetime import datetime
 
 import caosdb as db
 from caosdb.exceptions import TransactionError
@@ -300,5 +301,7 @@ def get_value(prop):
 
     if isinstance(prop.value, db.Entity):
         return prop.value.id
+    elif isinstance(prop.value, datetime):
+        return prop.value.isoformat()
     else:
         return prop.value