How to filter Alarm Session by Last Updated Time

[rbuha]

We are currently applying a time filter when registering an alarm session in API gateway.
If we set the filter like

{ “operator”: “gt”, “target”: “time”, “value”: “2026-01-05T07:00:00.000Z” }

, now when we fetch alarms for current session any alarms created before that time are excluded, even if they were updated after 07:00 Z.

We need these updated alarms to be included in the session. Since the API apparently does not support filtering directly by “LastUpdatedTime,” is there a supported workaround to capture these events?

[Bo_Ellegard_Andersen (Bo Ellegård Andersen (Milestone Systems))]

As I understand the documentation you should be able to filter on lastUpdatedTime.

Please elaborate on how you came to the conclusion that it is not supported.

[rbuha]

The API you have given is for listing alarms without any session.

We are here registering the session for fetching alarms and using this API.

Refer to the below API.

{"filterBy": [{"operator": "equals","target": "id","value": null}],"orderBy":......

Here in the allowed target for filterBy, there is no field named lastUpdatedTime.

[Bo_Ellegard_Andersen (Bo Ellegård Andersen (Milestone Systems))]

I figured it out, but I must admit I needed help from Milestone Development.

The target ‘modified’ will filter on lastUpdatedTime!
Changing your example, this works:
{ “operator”: “gt”, “target”: “modified”, “value”: “2026-01-05T07:00:00.000Z” }