Two modes: count the days, weeks or months between two dates, or add/subtract days, weeks, months or years from a date. Instant and local.
"How many days until the trip?" "What date is 90 days from now?" "Exactly how long was that project?" Dates are math we all do badly in our heads. This calculator does it cleanly.
Two modes: Difference counts the days (and weeks) between two dates; Add/Subtract shifts a date by days, weeks, months or years. Switch tabs and type.
It's for planning, deadlines, pregnancies, subscriptions — anywhere a date math mistake is annoying.
Calculated in your browser; nothing stored or sent. (Anonymous analytics only — privacy policy.)
Quick tip: months and years aren't fixed lengths, so "add 1 month" lands on the same day-next-month, not a tidy 30 days. Use days if you need an exact span.
Use Difference to count days/weeks between two dates, or Add/Subtract to shift a date by days, weeks, months or years. Results update live.