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How to Check if a Date is Within the Last Year in Access

Tauseeq Magsi Sep 25, 2026 869 views

Question details

The user wants to evaluate whether a specific date (such as a calibration date) occurred within the past year using a dynamic calculation in a query.

How to Check if a Date is Within the Last Year in Access Queries

Product: Microsoft Access
Device & OS: not provided
Scenario: Creating an Access query to return "Yes" or "No" depending on whether a date field falls within a 365-day period relative to the current date.
Observed behavior: Dynamic daily values should be evaluated via query rather than stored in a table, but relying purely on the "yyyy" year component in DateDiff can cause inaccuracies due to calendar year crossovers.

Before you start

Ensure you have your Access database open and know the exact name of the table and date field you want to evaluate (e.g., Calibration_Date).

Solution 1Recommended

Use DateDiff for an Exact 365-Day Period

This method calculates the exact number of days between your date field and today's date, returning "Yes" if it is 365 days or less.

Because leap years cause a year to have a variable number of days, checking the exact number of days is often the most reliable method for an annual requirement.

Avoid using DateDiff("yyyy",...) alone. It only compares the calendar year number, which can prematurely return a 1 even if a full 365-day year hasn't actually passed (e.g., comparing Dec 31st to Jan 1st).

Open Query Design

Open your Microsoft Access database, navigate to the Create tab, and click on Query Design. Add your target table to the query grid.

Enter the Expression

In a new blank column in the query design grid, type the following expression: In_Calibration: IIf(DateDiff("d", [Calibration_Date], Date()) <= 365, "Yes", "No")

Run the Query

Click the Run button (red exclamation mark) in the ribbon to view your dynamic Yes/No results based on today's date.

Use DateDiff for an Exact 365-Day Period

Dynamic Calculations: Always calculate dynamic values like age or status in queries rather than storing them in table fields, as they change daily.

Solution 2

Write a Direct SQL Query for Date Evaluation

If you prefer working with SQL code directly, you can write a SELECT statement to evaluate your dates.

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Frequently Asked Questions

Why shouldn't I use DateDiff with "yyyy" to check for a year?

Using DateDiff("yyyy", Date1, Date2) only subtracts the calendar year components. For example, comparing December 31, 2022, and January 1, 2023, will return 1 year, even though only one day has passed. It does not accurately calculate completed anniversaries.

Should I store the "Yes/No" calibration status in my Access table?

No. Because the status depends on the current date, it changes every day. Storing dynamic calculations in a table leads to outdated data. You should always calculate these values dynamically in a query when needed.

How do I handle leap years when calculating anniversaries in Access?

For exact completed years including leap year adjustments, you typically need to build a custom VBA function or a more complex query expression using DateSerial rather than a simple 365-day check. However, a 365-day DateDiff comparison is generally sufficient for most standard rolling-year requirements.

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