PowerShell

Get an FTP Listing Entry's Last-Modified Time

Demonstrates the Chilkat Ftp2.GetLastModifiedTimeStr method, which returns the last-modified time of a cached directory-listing entry as an RFC 822 date-time string. The only argument is a zero-based index.

Background: The last-modified time is the workhorse timestamp: it updates whenever a file's contents change and is what sync and mirror logic compares to decide whether a file needs re-transferring. It is the most reliably reported of the three across FTP servers, and the RFC 822 string carries a timezone so comparisons are well defined.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  Demonstrates the Ftp2.GetLastModifiedTimeStr method, which returns the last-modified time of a
#  cached directory-listing entry as an RFC 822 date-time string.  The only argument is a
#  zero-based index.

$ftp = New-Object Chilkat.Ftp2

$ftp.Hostname = "ftp.example.com"
$ftp.Username = "myFtpLogin"

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
$ftp.Password = "myPassword"

$success = $ftp.Connect()
if ($success -eq $false) {
    $($ftp.LastErrorText)
    exit
}

$success = $ftp.ChangeRemoteDir("public_html")
if ($success -eq $false) {
    $($ftp.LastErrorText)
    exit
}

#  GetDirCount retrieves the directory listing on the first call and returns the number of
#  entries.  A negative return indicates failure.
$n = $ftp.GetDirCount()
if ($n -lt 0) {
    $($ftp.LastErrorText)
    exit
}

for ($i = 0; $i -le $n - 1; $i++) {
    $name = $ftp.GetFilename($i)

    #  The value is an RFC 822 string such as "Fri, 21 Nov 1997 09:55:06 -0600".
    $lastModified = $ftp.GetLastModifiedTimeStr($i)
    $($name + "  modified " + $lastModified)
}

$success = $ftp.Disconnect()
if ($success -eq $false) {
    $($ftp.LastErrorText)
    exit
}