Скачать или смотреть How to Convert SSM Output & Unix Time Format to System Time in PowerShell and Save as CSV

Learn how to convert SSM output and Unix time format to the `mm/dd/yy` format using PowerShell, and save the results as a CSV file for easy data manipulation.
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Efficiently Converting SSM Output and Unix Time in PowerShell

When working with AWS SSM (Simple Systems Manager) to manage instances, you may encounter output data displayed in a Unix timestamp format. This can be problematic, especially when you need to convert this format to a more human-readable date format, like mm/dd/yy. In this guide, we'll walk you through the process of converting the SSM output and Unix timestamps using PowerShell, so you can easily analyze and save this information as a CSV file.

Understanding the Problem

The output from the aws ssm describe-instance-patches command typically produces data in JSON format. Here's an example of the output you might see:

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In this output, the InstalledTime is displayed as a Unix timestamp, which represents the number of seconds that have elapsed since January 1, 1970 (often referred to as the "epoch"). This format is not user-friendly, so we need to convert it to the mm/dd/yy format.

Step-by-Step Solution

To tackle this conversion, we will write a PowerShell script that processes the output of the SSM command, converts the Unix timestamps to a local date format, and saves the results as a CSV. Here's how it works:

Step 1: Retrieve SSM Instance Patches

First, you'll need to fetch the instance patch information using the SSM command:

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Step 2: Prepare the Output File

Next, define the path where you want to save your CSV file. For example:

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Step 3: Convert the Output from JSON format

Utilize the ConvertFrom-Json cmdlet to process the received data and expand the Patches property:

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Step 4: Build the Report Array

Now, create a report array where you'll save the converted patch information. Loop through each entry in the $array and convert the InstalledTime:

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Step 5: Export the Data to CSV

Finally, export the constructed report to a CSV file using the Export-Csv cmdlet:

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Final Script Overview

Bringing it all together, your final PowerShell script will look as follows:

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Conclusion

By following these steps, you can efficiently convert Unix timestamps provided by AWS SSM into a readable date format, and save the results into a CSV file for further processing. This method not only helps in managing your system updates more accurately but also facilitates better data analysis in reporting tasks. Happy scripting!