The Starting and Ending date controls which surveys will be selected. In other words, only those surveys that were done between the Starting and Ending dates will be displayed.
Note. If the survey dates are missing or in error, date exclusions can give strange results. For example, some people enter zeros when the exact date of the survey is unknown. This leads to surveys that appear to be hanging in space because the connecting survey's date is incorrect.
When you have finished setting the dates, press the "Select" button. This wall cause the program to select all the shots that fall within your selection lines. If the "Exclude Sections/Survey" checkbox is enabled, the cave map should change to reflect the shots that have been selected.