PowerShell Output to CSV by Date and Rename

I have a powershell script that gets Exchange calendar permissions and saves it to csv.  I'm working on creating an automated report that will email the changes in permissions on a daily basis.  One of the components I need assistance with is having the output saved to include the date in the file name in the form of YYYYMMDDcalpermissions.csv

Presently the script saves it as a static name, but when I run an automated daily comparison, I need a way to differentiate between yesterday's export and today.

How do I change the output to be named on variable based on the computer's date?

$Output | Sort-Object Mailbox | Select-Object Mailbox, User, {$_.AccessRights}, IsValid | Export-Csv -Path C:\CalendarPermissions.csv -NoTypeInformation

Thank you.
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fireguy1125Asked:
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SubsunCommented:
Try..
$Output | Sort-Object Mailbox | Select-Object Mailbox, User, {$_.AccessRights}, IsValid | Export-Csv -Path "C:\$(Get-Date -F yyyyMMdd)-CalendarPermissions.csv" -NoTypeInformation

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footechCommented:
$outfile = "c:\$(get-date -f yyyyMMdd)calpermissions.csv"

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then substitute the variable for the path parameter
Export-Csv -Path $outfile -NoTypeInformation

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footechCommented:
Looks like Subsun beat me to it...  :)
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