Breaking down CSV file information by date

CSV_Breakdown_By_Date.ps1

$files = dir *.csv | where {$_.length -gt 0}

$z = foreach ($file in $files) {
	write-progress -id 1 -activity $file.name -status "processing..."
	$x = import-csv $file
	$y = new-object -type psobject -Property @{
		Project = $file.basename
		Total = $x.count
		Nov2014 = ($x | where {($_.date -ne $null) -and ([datetime]$_.date -gt [datetime]::parse("11-1-2014")) -and ([datetime]$_.date -lt [datetime]::parse("12-1-2014"))}).count
		Dec2014 = ($x | where {($_.date -ne $null) -and ([datetime]$_.date -gt [datetime]::parse("12-1-2014")) -and ([datetime]$_.date -lt [datetime]::parse("1-1-2015"))}).count
		Jan2015 = ($x | where {($_.date -ne $null) -and ([datetime]$_.date -gt [datetime]::parse("1-1-2015")) -and ([datetime]$_.date -lt [datetime]::parse("2-1-2015"))}).count
		Feb2015 = ($x | where {($_.date -ne $null) -and ([datetime]$_.date -gt [datetime]::parse("2-1-2015")) -and ([datetime]$_.date -lt [datetime]::parse("3-1-2015"))}).count
	}
	$y
}
$z | select Project,Total,Nov2014,Dec2014,Jan2015,Feb2015 | export-csv -NoTypeInformation TFS_Nov2014-Feb2015Activity.csv