I used to do mine on an excell spreadsheet, use a new worksheet for each member of staff, with internal links to a summary page on the front of the workbook to show sick days holidays, etc, I only had 12 or so people to track and it worked quite well, easy to add pages for new staff, and can keep personal details handy too.
I dont have the template now but it didn't take to set up, and it evolved a bit over the years to record such things as disciplinary hearings, accidents, etc.