Date Calculator: Days Between

Date Calculator answers the two date questions that come up most often: how long is it between two dates, and what date do you land on after adding or subtracting a period of time.

Use Date Difference to pick a start date and an end date and see the gap expressed in days, weeks, months, and years. It is the quick way to work out a project timeline, a notice period, how long remains until a deadline, or how many days have passed since an event.

Use Add / Subtract to start from any date, enter an amount, choose days, weeks, months, or years, and get the resulting date immediately. Delivery windows, renewal dates, probation periods, and follow-up appointments all fall out of a couple of taps.

Both tools handle leap years and month lengths correctly, so a month added to the 31st behaves the way you expect rather than silently rolling over.