diff --git a/wis2box-management/wis2box/api/backend/elastic.py b/wis2box-management/wis2box/api/backend/elastic.py
index b02e77e4..e2cc55cb 100644
--- a/wis2box-management/wis2box/api/backend/elastic.py
+++ b/wis2box-management/wis2box/api/backend/elastic.py
@@ -78,7 +78,10 @@
                     }
                 },
                 'phenomenonTime': {
-                    'type': 'text'
+                    'type': 'text',
+                    'fields': {
+                        'raw': { 'type': 'keyword'}
+                    }
                 },
                 'wigos_station_identifier': {
                     'type': 'text',