This problem may be due to the browser you are using. Chrome browser is most recommended for filling out this database. In filling dates on this database, take advantage of the inbuilt Date-picker tool in Chrome browser. First Click on the year, a drop-down menu should appear and you can easily scroll down and select the applicable year. Then you can click on the month, another drop-down menu will appear, scroll down to the applicable month. The days of the month are already displayed, simply click on the applicable day.