how to find matching amount in tableau

Hi All,

The above screenshot is the data form which I'm using for my chart.

The chart has to show the TAT(difference of dates) where the there are various buckets with <30 days, >=30 to <60 days.. etc.

Flag = 1 is debited amount

Flag = 2 is credited amount

I have to get the difference of the date where the amount is matching with Debit and Credit.

How do i match the amount in tableau and and make use of it in chart preparation.

Please help me on this

Thanks in advance.