Intel® DAL supports the getting and setting of a secure time using the platform Protected Run-Time Clock (PRTC). There is no globally available initial time. Therefore, trusted applications still need to get the initial secure time from some trusted source, such as Sigma.
For security reasons, each set trusted application time is independent of all other trusted applications and their set times.
Applications can use this feature to create their own notion of time. The feature can be used to always know the current time.