Help Creating Smartsheet formula

I need a smartsheet formula that will compare rows that have the can detect when two rows have the same "Serial Number" (Serial Number column) and extract/identify the one with the latest "Date" (Calibration Date column)

We were able to use the following formula to identify which rows have the same/duplicate Serial Numbers

=IF(COUNTIF([Serial Number]:[Serial Number], [Serial Number]@row) > 1, 1, 0)

The following formula was used in excel and worked:


Where D is Date and A is the Serial Number

Please help :(


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