Calculate the date on a number of weeks ago from today using the calculator below.

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How to Calculate the Date Several Weeks Ago

Whether you’re reviewing past events, tracking project milestones, or analyzing historical data, you might need to find the date a specific number of weeks ago. Fortunately, there are a few easy ways to calculate it accurately.

Method One: Manual Calculation

The simplest way to determine a date several weeks ago is by using a calendar.

  • Start by locating today’s date.
  • Move backward one week at a time until you’ve counted the desired number of weeks.
  • When you reach the beginning of a month, continue into the previous month and keep counting.

This approach works well for short time spans but becomes more tedious when going farther back in time. For instance, calculating the date 52 weeks ago requires counting through an entire year.

Method Two: Using Spreadsheet Software

A faster and more accurate method is to use spreadsheet programs like Microsoft Excel or Google Sheets.

  1. Open a new sheet and enter the starting date (for example, today’s date) in any cell – let’s say A1.
  2. In another cell (e.g., B1), enter the following formula to subtract eight weeks from the date in A1:
=A1 – (8 × 7)

This formula subtracts 56 days (8 weeks × 7 days) from your starting date.

If you want to find a different number of weeks ago, simply replace 8 with the number of weeks you need. And if your date is entered in a different cell, adjust the formula to reference the correct cell.