---
title: How to update the date and time on the instrument (Polarimeter AP IV, V, VI)
description: Step-by-step instructions for updating the date and time on the instrument itself (Polarimeter IV, V, VI).
---

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# How to update the date and time on the instrument (Polarimeter AP IV, V, VI)

## Step-by-step instructions for updating the date and time on the instrument itself (Polarimeter IV, V, VI).

1\. Select the Setup menu option

2\. Enter the passcode 123

3\. Click on the Login button

4\. Select the Operational Parameters menu option

5\. Update the date/time

Note: if the instrument 

6\. Select Save & Exit

7\. Click on the icon of the Home located on the upper right corner of the window to get back to the main screen.

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