Time interval between two date columns

Questions
1

I have a dataset with two date column, ‘start_date’ and ‘end_date’. Is there a way to easily create
a ‘duration (days)’ column?

2

Use DateDifferenceWithColumn function. For your particular case, execute the following command from the console (View | Console):

DateDifferenceWithColumn("table_name", "start_date", "end_date", "duration (days)", "days")

Please note that the last parameter - units can take the following values: years | months | weeks | days | hours | minutes | seconds | milliseconds