Calculated column using aggregated if statment

I have a table where multiple entries can be entered for one transaction but I need to mark the most recent transaction using a timestamp column.

Criteria1 Criteria2 Timestamp CalulatedColumn
1 11/14/2017 11/14/2017 1:22:58 AM  
1 11/14/2017 11/14/2017 3:23:22 AM MARK
2 11/14/2017 11/14/2017 1:23:14 AM  
2 11/14/2017 11/14/2017 1:59:22 AM MARK

Need some help figuring out the formula to get the result shown above.

Thanks!

(1) Answer

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