Date Calculator – Add and Subtract Days, Weeks, & Months

Use our date calculator to add or subtract days, weeks, months, or years from any date.

By

Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

Full bio

How to Add Days, Weeks, or Months to a Date

You can add days, weeks, or months to a date using a few methods. The easiest way is to use a calculator such as our adding days or adding weeks calculators.

You can also add days, weeks, or months to a date manually.

Step One: Identify the Start Date

The first step is to identify the start date. You can use a paper or digital calendar and find the starting date.

Step Two: Add Months

The next step is to add the months to the date. Advance the date on the calendar one month for each month you want to add.

Step Three: Add Weeks

Then, you can add the weeks to the date. Continue to advance the date on the calendar one week for each week you want to add.

Step Four: Add Days

Finally, add the days to the date. Just like before, advance the date on the calendar one day for each day you want to add. You can use this method to find the date 28 days from today, for example.

You might also be interested in our date range calculator to find the duration between two dates.