How can I calculate a persons age in Powershell

Question

I very new to Powershell so appologise for probably asking a very basic question.

I need to write a script to show how old a member of staff is in years and months.

I need to convert a string that is in the format of "25-09-1973" to a date format so I can then subtract it from todays date but everything I try is coing out wrong.

Two days of Googling has not helped me write the script how I want it to appear as I can not do the maths on the dates.

Can anybody help me out ?

Answer 1

Hi Billy the Mexican,

Thank you for posting on Microsoft Q&A.

You can use the DateTime.ParseExact method.

https://learn.microsoft.com/en-us/dotnet/api/system.datetime.parseexact

$dateString = '25-09-1973'
$date = [datetime]::ParseExact($dateString,'dd-MM-yyyy',[CultureInfo]"en-US")
$age = [datetime]::Now - $date

Best Regards,

Ian Xue

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Answer 2

Thanks for pointing me in the right direction, I have followed your instructions and am nearly there as I can divide the number of days by 365 and I get the how old the person is in number of years.

Does PowerShell have a built in function to show how many months have passed since a certain date?

I was going to try and write a script to calculate this but thought that PowerShell may already do this.