Creating a command button from a form into a Data Access Page (1 Viewer)

Creating a command button from a form into a Data Access Page in Access with Java

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Hi I created a command button to calculate time taken on a form like below

Private Sub Command46_Click()
Time_Finished.Value = Time()
Time_Taken.Value = Time_Finished.Value - Time_Started.Value
Complete.Value = True


Could someone please tell me how to do this in a data access page do I need to do it in Javascript if so how?

Thanks