epoch_timestamp
epoch_timestamp()
Returns the UNIX epoch, which is midnight Jan 1 1970 UTC. This is the baseline "Zero" for all time stamps.
epoch_timestamp()returns the timestamp1970-01-01T00:00:00 +00
model
model()
Returns the Model. See Concepts.
You can add fields to the Model using the Schema Editor, and then use this expression to reference them, for example model().u_added_field