Date Calculator
Find the duration between two dates, or add and subtract days, months, and years.
How to Calculate Dates Online for Free
1. To measure a span, pick a start and end date and press Calculate.
2. Read the difference expressed in days, weeks, months, and years.
3. To shift a date, choose a base date, then add or subtract an amount.
4. Pick the unit — days, months, or years — and read the result date.
Date Math in Your Browser
Every calculation runs inside your browser using your device clock. No dates you enter are ever sent to a server.