How to pass items in for each loop to workflow argument

Hello, how can I pass the dateitems below to the loop?

In this workflow, I want to pass the dateitem(20190311 to 20190313) as my next workflow will change based on the dateitem. However, even after I have imported argument. This does not work.
Thank you.

@123_123, when you enter the Body, you can assign a variable filteredDates = Dates.Select("[name of datatable column] >= ‘20190311’ and [name of datatable column] <= ’ 20190313’") and then use outuput data table activity.

Thank you , but my data is in string format, I am not sure how to pass the string in item to then workflow within the same for each loop.