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Date Calculator

Add or subtract days, weeks, months and years from any date.

Calculators Reviews Free · no sign-up

Business-day mode uses the days field only — years, months and weeks are ignored.

Resulting date

—

Days from start—
Week number—
Day of year—
Leap year—

Quick Tool Overview

The Date Calculator adds or subtracts days, weeks, months and years from any date and returns the resulting date with the weekday it falls on. A business-days mode skips weekends, which is what contracts and shipping estimates almost always mean by "days".

What it does
Adds or subtracts time from a date
You give it
A start date and an amount to add or subtract
You get back
The resulting date and its weekday
Best for
Deadlines, notice periods, contracts and delivery dates
Calculators Free, unlimited use No sign-up Runs in your browser

About the Date Calculator

Pick a start date, choose how much time to add or subtract, and get the resulting date along with the weekday it falls on. Days, weeks, months and years can be combined in one calculation.

A business-days mode skips weekends, which is what contracts, notice periods and shipping estimates almost always mean by "days". Month arithmetic is handled the way people expect rather than by adding a fixed number of days: one month after 31 January lands on 28 February, or 29 in a leap year, because there is no 31st. Leap years are handled by real calendar rules throughout.

Key features of the Date Calculator

Business-days mode

Skips weekends, which is what a contract, a notice period or a shipping estimate usually means.

Units combined

Days, weeks, months and years can all be applied in one calculation.

Month arithmetic done properly

One month after 31 January lands on 28 February, or 29 in a leap year, because there is no 31st.

Real leap year rules

Calendar arithmetic throughout, not an approximation based on 365.25 days.

Weekday returned

The day of the week is given with the date, which is usually the next thing you need.

How to use the Date Calculator

  1. 1

    Choose a start date

    Pick any date from the calendar. It defaults to today.

  2. 2

    Set the amount to add

    Enter days, weeks, months or years, and choose whether to add or subtract.

  3. 3

    Switch on business days

    Optional. Counts working days only, skipping Saturdays and Sundays.

Frequently asked questions

You get 28 February, or 29 in a leap year, because February has no 31st. The calculator clamps to the last valid day of the target month, which is the standard convention.

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