Calculate days between two dates, or add and subtract days from any date. Perfect for deadlines and planning.
This date calculator works out the number of days, weeks and months between two dates, and can add or subtract days from a date to find a deadline, anniversary or due date. It's handy for project planning, counting down to events, or working out notice periods.
All calculations use the real calendar, including leap years, and run instantly in your browser.
Counting days between dates sounds trivial until you actually need it: property settlement periods of 30, 60 or 90 days, rental notice periods, visa validity windows, warranty deadlines, pregnancy milestones and project timelines all hinge on exact day counts. This calculator does the counting on the real calendar, so leap years and different month lengths never trip you up.
The add-or-subtract mode answers the reverse question: what date is 90 days from today? That is the natural way to work out a settlement date, a follow-up appointment, the end of a probation period or when a 14-day cooling-off window closes.
A tip when deadlines matter: check whether the period in your contract or notice counts calendar days or business days, and whether the start day itself counts. Conventions differ between documents, and a one-day difference can matter when a deadline is legally binding.