How could I attach start time stamp to save data file in simulink?

Hello,

I have a Simulink model that collects some data from and external source. Multiple block outputs are connected to a Bus which are then connected to e 'To File' block to save the data to file.

I need to know the start time of the acquisition (when the model starts running), and I would like to attach the time stamp automatically to the end of the file being saved (i.e. 'filename_yyyy-mm-dd_HHMMSS.mat').

I have manipulated the 'startFcn' callback of the model to create a time stamp and save it in workspace. I tried to manipulate the 'stopFcn' callback to the 'To File' block to add the time stamp to the end of the name, or alternatively I try to use the 'movefile' function to move the file to another with the full name (with time stamp).

The problem is that (with both approaches) I get an error/warning message saying that 'No Matching Files Were Found' or that 'You can not rename a file while the model is running'; both of which I believe is due to the fact that at the point when the 'stopFcn' callback is being executed the model hasn't fully stopped yet.

Any ideas on how I could get around this problem or another way I could use to do what I want; are much appreciated.

Thank you.