Time & Date Tools

Free time and date calculators — work out hours between times, average durations and countdowns in seconds, with the steps shown. No signup.

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.