How to get the row number of the most recent date in the date column of a data table?

[#1]

I want to get  the row number of the most recent date in the date column of a data table? 

Trying the following for the Date column in my data table

colmax(Data Table( "myData" ):Date);

gives me a number which is much greater than the number of rows in my data table so not making sense. Any direction would be useful. 

[#2 · Accepted solution]

dt << get rows where (:date == col Maximum(:date))

Just Col Max  gives you the max date (in seconds). Then compare the max with the individual values to find the matches.