Simulink: Need help using simulation time as a variable in Simulink Calculations

Hi,
I'm working on some Simulink code that does calculations for elastances in the heart and I want to set the simulation time and step size to be controlled by variables in my MATLAB script. I also was trying to figure out how to use the simulation time as a variable to input into my calculations. So for example, if the current simulation time is 2.05 seconds I want to use that single value in the area circled in blue below. I'd greatly appreaciate the help with this. Please let me know if you need more explaination.
Thanks!

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I've attached an image depicting my code and the area I need help with in the Time Image.PNG.

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 采纳的回答

Use the Clock block from Simulink Sources.

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