通过文件创建日期范围限制Powershell Get-ChildItem

I use a Powershell command to generate a CSV report of certain file types. My goal is to find out how many were added during a particular date range. Right now, the script finds everything and I sort by date to find my number. I'd like to modify the command to only return objects within a creation date rage, i.e. if this file was created between 1 March 2013 and 31 March 2013. There's probably a way to limit the command by a date range, likely using Select-Object, I just can't figure it out.I use a Powershell command to generate a CSV re