REST API use greater than and less than parameters

Hello,

Does anyone know how to use parameters with REST API get requests.

For example to get last one hour alerts.

I can get list of alerts using this request : GET /univmax/restapi/system/alert

And specific alerts using equal sign :

GET /univmax/restapi/system/alert?created_date_milliseconds=1610638447762

But can't get alerts LT ot GT a value.

I the REST API guide I found this without any example.

created_date_milliseconds : Optional value that filters returned list to display Alert Ids that contain greater than(">1"), Less than("<1") or equal to the specified date in milliseconds

Thanks