Time dependant boundary conditions

Hello, I am using SfePy and I would like to know if there is a way to get the time of simulation to have a time dependant boundary condition (if the time of simulation is stocked in a variable for instance).

I saw that we could manually specify when to change the boundary conditions at a specific time, I think i's possible to do something like that, but it would be really more convenient for me directly to get the time variable if it exists, but I couldn't find it on the examples.

Can I find this variable somewhere?

Thank you very much!

Marco