Time & Date Tools

Hours, countdowns and more — time questions solved fast.

These tools answer the time and date questions that come up all the time — how many hours are between two times, what the average of several durations is, or how long until a date. Enter your values and ziffaro computes the result instantly in your browser, with the steps shown, so you can check lap and race times, log work hours, or plan around a deadline. Times can be entered as hours, minutes and seconds and mixed freely, and everything is free with no signup. Whether you are adding up a timesheet, averaging split times, or counting down to an event, these calculators save you the fiddly manual arithmetic and the risk of a slip. Because time uses base-60 rather than base-10, hours and minutes are easy to add up wrong by hand — carrying 60 seconds into a minute and 60 minutes into an hour trips people up constantly. ziffaro handles that conversion for you and shows the result to the second, so a long list of durations totals correctly the first time. More time and date tools are added as common questions come up.