Refresh Date (Manual refresh)

There are three options:

There are two ways to write a measure that returns the most recent date / processing date in your data model.

1. If you have a data(transaction) table

Most Recent Transaction = CALCULATE( MAX(Transactions[Date]), ALL(Transactions) )

2. If you have a calendar table - there's a two step process

     A. Create a calculated column

Processing Date Flag = IF( Calendar[Date] = Now(), 1, 0 )

     B. Create a measure

Processing Date = CALCULATE( MAX(Calendar[Date]), Calendar[Processing Date Flag] = 1 )

The third way is a lot easier. You can edit a tile on your dashboard to show the last refresh date.  This is better in a way because each tile will show the right date for the underlying data set

3. Click on the "..." on the top right of a dashboard tile.  This opens up a menu click on the pencil icon which will bring up a properties menu.  Check the box to turn on last refresh date.  The only downside is you'll have to go and do this for every tile on your dashboard.

Editing a TileTurning on Last Refresh Date