title: get certain years out of other sheets
body: <p>At work we have a worksheet with serveral (40-50) worksheets. Each worksheets represent a certain study. Several people are on each sheet with a name, surname, start of study (date), birthday, etc. And we have one worksheet with an overview. (worksheet study 1, worksheet study 2, worksheet study 3). </p>
  
  <p>Is there any way, that I can place a column on overview, and filter on the people that have joined a study. (so all people that joined a study in year 2016, but not those that did not.) I have a column with the start date of a study, but people can join a study after a study has started.</p>
  
  <p>I've already tried to use a filter, and tried some stuff with data validation, but Im nowhere close to a a solution. Is there anyone who can put me on the right track? </p>