I loved this tool until I found a major problem with the way the tool calculates months: 11/14/16 - 11/24/20 1472 days 4.032877 years 48.39452 months Plug these dates into the calculator and 49.06667 months are calculated!!! (This is because the tool is using 30 days/month calculation INSTEAD of the true 30.41667 days/mo over 12 months). I would give this tool 5 stars if there was not this algorithm issue. In my nature of work I need exact durations so sadly I cannot use it.