Date Calculator

Calculate the number of days between any two dates, or add and subtract days, weeks, or months from any date. Useful for deadlines, countdowns, and planning.

Select dates

Start date

End date

days between dates

Weeks

Months

Years

How to use the date calculator

📅

Days between dates

Enter a start and end date to find the exact number of days between them. The result is also shown in weeks, months, and years. Useful for project timelines, deadlines, and contract lengths.

+−

Add or subtract days

Pick a start date, choose whether to add or subtract, and enter the number of days. The resulting date is shown with its full day of the week — useful for calculating notice periods and due dates.

The days-between calculation accounts for leap years and the varying lengths of each month, giving you an exact count rather than an approximation. The add/subtract function works the same way — accurately handling month-end rollovers and year boundaries.

Common uses include calculating how many days are left until an event, working out a payment due date, finding the end of a contract or notice period, or checking how long ago something happened.