Shiny filter app

Hello, good night everyone. I am trying to make a shiny app with a database that has dates and values. The idea is the following: Have two text boxes in which you enter the dates and that the output is the resulting value of subtracting the two values related to those dates. It occurs to me that I could use the filter() function to be able to get the individual values for each date, but from there I'm not sure how to get the respective output. Does anyone have any ideas I could go on with?

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