Date Calculator
Calculate days between dates, or add/subtract years, months, and days from any date.
Why people choose us
Private by design
Your input is processed securely and never sold. Client-side tools never leave your browser at all.
Instant & free
No installs, no waiting. Results in seconds, right in your browser, on any device.
Free forever
No sign-up, no watermarks, no limits. All client-side tools are free to use as much as you like.
Frequently asked questions
How does date difference calculation work?⌄
Counts days between two dates using precise date arithmetic, broken into years/months/days plus totals.
How are business days calculated?⌄
Excludes Saturday and Sunday. Public holidays are not excluded — adjust for your country's specific holidays.
How does date add/subtract work?⌄
Pick a base date and positive/negative amounts. Processes years first, then months, then weeks+days, handling month-end boundaries correctly.
What happens with month-end dates?⌄
Adding 1 month to Jan 31 → Feb 28/29. The calculator caps at the last valid day of the target month.