Add and Subtract Days from Date

Add or subtract days, weeks, months, or years from any date. Get the resulting date instantly.

1. Enter your starting date using the date picker or type it directly into the input field. 2. Toggle the operation between add and subtract to determine the direction of the calculation. 3. Enter the number of days, weeks, months, or years you want to add or subtract - you can combine multiple units in one calculation. 4. View the resulting date displayed instantly, along with the day of the week it falls on. 5. Copy the calculated date for use in contracts, project timelines, or deadline tracking.

About This Tool

The Add and Subtract Days tool lets you calculate a new date by adding or subtracting a specified number of days, weeks, months, or years from any starting date. Enter your base date, choose the amount and unit, and see the resulting date immediately.

This is perfect for determining deadlines, expiration dates, due dates, and delivery windows. Need to know what date falls 90 days from today? Or what day it was 6 months ago? This tool answers those questions in a single step.

The calculator handles month-end edge cases intelligently. For example, adding one month to January 31 yields February 28 (or 29 in a leap year). It also supports combining multiple operations so you can add 2 months and 15 days in one calculation.

Frequently Asked Questions

Adding one month to January 31 results in February 28 (or February 29 in a leap year). The calculator clamps to the last valid day of the resulting month to avoid invalid dates.

Yes. You can combine years, months, weeks, and days in a single calculation. For example, add 1 year, 3 months, and 10 days from a starting date.

This tool counts calendar days including weekends and holidays. If you need to calculate business days only, use the Working Days Calculator instead.

Yes. Toggle the operation to subtract and enter the number of days, weeks, months, or years to go backward from your starting date.

The calculator supports dates across a very wide range. You can add or subtract thousands of years if needed, though practical use cases rarely exceed a few decades.

Related Tools

Date Difference Calculator

Find the exact number of days, weeks, months, and years between any two dates. Fast and accurate.

Date and Time

Working Days Calculator

Calculate the number of working days between two dates, excluding weekends. Plan project timelines accurately.

Date and Time

Days Until and Countdown Calculator

Count down the days, hours, and minutes until any upcoming date or event. Set a target and watch it tick.

Date and Time

Week Number Calculator

Find the ISO week number for any date. See which week of the year a specific date falls in.

Date and Time

Day of the Week Calculator

Find what day of the week any date falls on. Works for past, present, and future dates across centuries.

Date and Time

Age Calculator

Calculate your exact age in years, months, and days from your date of birth. Find age at any past or future date.

Date and Time