Format of Time and Date columns in Agent Behavior Logs

Good afternoon. I am developing some reports that read information from the sem5 database in SQL. Specifically, from the dbo.AGENT_BEHAVIOR_LOG_1 and 2 tables. The date and time columns use what appears to be an offset value: i.e. Time_Stamp is 1433255648842. Does anyone know the formula or the calculation needed to convert these columns to the actual date and time?

Thank you.