I'm trying to use the ovirt REST api to read snapshot date but the number I'm getting back doesn't appear to be in epoch time. What format is it?

Example:

"date":1565299725928,"snapshot_status":"ok"

Should be "Aug 8, 2019", epoch conversion put it at Tue May 16 16:25:28 51572.

(accessed via https://$HOSTNAME/ovirt-engine/api/vms/$value/snapshots)