Trying to track names with days, months, and year(s)

Good day and Happy New Year, I have Excel 2007 at home and 2003 at work. I have a question, I am a case manager and would like to learn a formula(s) that will allow me to list my caseload of names into excel while also listing their days, months, and years in the program. I would like to have a database of names with their arrival dates in the program and have their remaining dates in days, months, and years. Example John Smith, arrival date (I submit 1/1/12), days total (1 days), months total (less than a month), years total (less than a year). Please assist if you can. Thank you