# DateAdd() Function

**YouTube:** [How to Use the DateAdd() Function in Report Custom Columns?](https://www.youtube.com/watch?v=nV83ZdKfumU)

## How to Use the DateAdd() Function in Report Custom Columns?

In this tutorial, we will learn how to use the **`DateAdd`** function to perform **date arithmetic**—like adding months or days to an existing date, such as a bill date.

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### Accessing the Expression Designer:

* Navigate to the **Reporting** section.
* Open the **Sales Register Detailed Report** or any **"Report".**
* Go to **Setup Column Attributes**.
* Here, you'll see a list of available columns that can be used to build expressions.
* Click on **"Add/Edit Expression Columns"** where you can write your expression using predefined functions.

<figure><img src="/files/QqZlgPb7nJy0O1lsvxB5" alt=""><figcaption></figcaption></figure>

* Before adding the expression to the report, go to **Other Settings**.
* Ensure the **Script Editor** is set to **VBScript**.

<figure><img src="/files/US8rZzar6siLdptkuOMX" alt=""><figcaption></figcaption></figure>

* Click **Save**.
  * *Note: VBScript is the default for new configurations but always verify this setting.*

### Writing Your First Expression

* Every expression must start with the script header: **'#@LSCRIPT**

<figure><img src="/files/K37bBe9AvTCKOiLXaocU" alt=""><figcaption></figcaption></figure>

* Click the (+) Plus icon to create a new expression.
* Fill in the required fields:&#x20;
  * **Expression Name** – A unique name for your expression.
  * **Expression Type** – Choose either **Text** or **Numeric** depending on the expected output.

<figure><img src="/files/XEPKB259r4WFeRjtFYxf" alt=""><figcaption></figcaption></figure>

### Creating a Simple DateAdd() Expression

* Double-click the new expression name to insert it into the script editor.
* Define the expression using the syntax:
  * **Expression Name** = DATEADD("M",CDATE(BILL\_DATE),4)
    * `"M"` → adds months.
    * `CDate(BILL_DATE)` → converts the bill date into a valid date format.
    * `4` → number of months to add.

<figure><img src="/files/mWq5EwSCvbLSlEgsfEOE" alt=""><figcaption></figcaption></figure>

* Save the expression once defined.
* Scroll down and **check the box** beside the expression name to enable it.

<figure><img src="/files/xa0iaKT5C7JzXh284Ztc" alt=""><figcaption></figcaption></figure>

* Save and proceed to check the effect.
* **Refresh the report** to view the final result.

<figure><img src="/files/6ScAFtdV7CCE6YOF0H95" alt=""><figcaption></figcaption></figure>

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### Output:

* If your bill date is `01/06/2025`, the `"M"` interval will show: `01/07/2025`.
* The `"D"` interval with 10 days will show: `11/06/2025`.

This function is useful for calculating **due dates**, **next follow-up dates**, **expiry dates**, or **any schedule based on the transaction date**.


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