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Set a Custom Last-Modified Date in a Gzip File

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This example demonstrates how to use the SetDt method to specify a custom last-modified date and time that will be embedded in a Gzip file.

A CkDateTime object is first initialized with a specific date/time using an RFC 822 formatted string. This date/time is then applied to the Gzip object using SetDt.

When a compression method is called (such as CompressStringToFile), the specified date/time is included in the Gzip metadata. This allows the resulting .gz file to carry a meaningful timestamp rather than using the current system time.

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Local $bSuccess = False

; This example demonstrates how to set a custom last-modified date/time
; that will be embedded in a Gzip file.

$oGzip = ObjCreate("Chilkat.Gzip")
$oDt = ObjCreate("Chilkat.CkDateTime")

; Set the date/time using a timestamp format (ISO 8601 style):
$oDt.SetFromTimestamp("2025-11-15T12:45:26-05:00")

; Apply the date/time to the Gzip object:
$bSuccess = $oGzip.SetDt($oDt)
If ($bSuccess = False) Then
    ConsoleWrite($oGzip.LastErrorText & @CRLF)
    Exit
EndIf

; Compress a string so the custom date/time is embedded in the .gz:
Local $sInputStr = "Example text for Gzip compression."
$bSuccess = $oGzip.CompressStringToFile($sInputStr,"utf-8","output.gz")
If ($bSuccess = False) Then
    ConsoleWrite($oGzip.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Gzip file created with custom last-modified date." & @CRLF)