CMD: remove files based on date and extension

Hello experts,
I have the following procedure to remove files. I was wondering how to add extension attribute to remove files based on date and specific extension.
If you have questions please contact me.
Thank you.

WITHOUT SUBFOLDERS
ForFiles /p "C:\FolderName" /d -30 /c "cmd /c if @isdir == FALSE del @file"
WITH SUBFOLDERS:
ForFiles /p "C:\FolderName" /d -30 /c /s "cmd /c if @isdir == FALSE del @file"

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