---
title: "1040 - 8879 Invalid Signature Date"
canonical: "https://support.crosslinktax.com/space/CSC/1869285536/1040%20-%208879%20Invalid%20Signature%20Date"
format: markdown
---
## **Issue Symptoms**

> ℹ️ When I am verifying a return, the following error message appears: **‘FRM 8879 PIN Signature Date Invalid’**

 

## **Issue Cause**

> ⚠️ This issue can occur if an invalid signature date is entered on the 8879, or if the date or time on the computer’s system clock is incorrect.

 

## **Issue Resolution**

**Method 1 - Verify the date Entered on Form 8879:**

1. Click **FRM 8879 **from the** Attached Forms**.

2. Confirm the correct date is present in the **Signature Date** box.

 

![image](media://47cdc0b9-0328-449f-ae2f-fb686824b18c)

 

> 📝 Typically, the date should reflect the time of the filing, but also verify the date entered is **not a future date**.

 

**Method 2 - Verify the Date and Time on Your Computer: **

**Refer to the following Microsoft knowledge base articles:**

- <u><span style="color: #1f73b7">[Setting the system clock in Windows](https://support.microsoft.com/en-us/windows/how-to-set-your-time-and-time-zone-dfaa7122-479f-5b98-2a7b-fa0b6e01b261#:~:text=To%20set%20your%20time%20and%20time%20zone%20in%20Windows%2010,%26%20language%20%3E%20Date%20%26%20time.)</span></u>