I wanted to directly retrieve the date of the beginning and end of the interview.
As with ODK Collect, there are the variables START and END, which allow you to retrieve this information automatically
Survey Solutions may, helpfully, give you multiple start and end times for interviews. With ODK, an interview is a linear process: start the interview; end the interview; and do not return to revise. Hence, there is probably only one start and one end time. With Survey Solutions, an interview may be iterative: interviewer completes the interview initially, supervisor rejects the interview, interviewer revises/comments the interview; etc. Hence, Survey Solutions captures this rich information. If the analyst, wants the ODK-style start and end times. they can be extracted from the interview__actions file. The end time will be the last Completed status for each interview. If the analyst wants a richer view, those richer process data are there.