SSIS reusable transformations

Hi,

I am using SSIS 2015.   

I have a table which has 30 DATE columns. I want to apply transformation logic on these date fields. the logic is same but it has to be applied on all 30. Instead of writing the code again and again in derive transformation expression 30 times, is there a way to write kind of function, which when called by passing my date field as parameters returns me the expected result.

similar to this I have transformations for multiple data types. So is there a way to write re-usable transformation expression in SSIS

Thanks