SharePoint 2013: Get the sites which are not modified since 90 days

if ((Get-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq $null)

{

    Add-PSSnapin "Microsoft.SharePoint.PowerShell"

    Get-PSSnapin -Registered

 

}

    $webApp = Get-SPWebApplication $siteUrl

    $daysInActive = Read-Host "Enter in number of days to check since last modified"

    $date = (Get-Date).AddDays(-$daysInActive).ToString(“MM/dd/yyyy”)

    $SiteDetail = @();

   

    foreach ($web in $webApp | Get-SPSite -Limit All | Get-SPWeb -Limit All)

    {   

        if ($web.LastItemModifiedDate -le $date)

        {

             $row = new-object PSObject

               # Add-member -inputObject $row -memberType NoteProperty -Name "Title" -value $web.Title

                Add-member -inputObject $row -memberType NoteProperty -Name "Site Name" -value $web.Name

                Add-member -inputObject $row -memberType NoteProperty -Name "URL" -value $web.Url

                Add-member -inputObject $row -memberType NoteProperty -Name "Last Modified Date" -value $web.LastItemModifiedDate

                Add-Member -InputObject $row -MemberType NoteProperty -Name "Site Owners" -value $web.site.Owner

                Add-Member -InputObject $row -MemberType NoteProperty -Name "Owners Email" -value $web.site.Owner.Email

                Add-Member -InputObject $row -MemberType NoteProperty -Name "Size in GB" -value $web.site.Usage.Storage

                Add-Member -InputObject $row -MemberType NoteProperty -Name "User Hits" -value $web.Usage.Hits

                Add-Member -InputObject $row -MemberType NoteProperty -Name "All Users" -value $web.AllUsers.Count

               

               

                $SiteDetail += $row;

              

        }

       

    }

    $SiteDetail

    $sitedetail | Export-Csv -Path "C:\Tempsc\Sites.csv"