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If you are passing the same date into the input tool and the formula tool you will be able to use one control parameter and two action tools.
Inside the action tool can you make sure you are selecting replace a specific string and remove just the quotes around the value you have in the formula tool.
It seems you have null in the formula tool, but to ensure you are replacing the correct value, I would suggest adding a dummy date in the field in quotes. You can select the value and use 'replace a specific string'. Please just remove the quotes, do not delete the whole string a type the date.
This applies the same for the file path. Please delete everything but the date you are replacing.