(Lianja) 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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llSuccess = .F.

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

loGzip = createobject("CkGzip")
loDt = createobject("CkDateTime")

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

// Apply the date/time to the Gzip object:
llSuccess = loGzip.SetDt(loDt)
if (llSuccess = .F.) then
    ? loGzip.LastErrorText
    release loGzip
    release loDt
    return
endif

// Compress a string so the custom date/time is embedded in the .gz:
lcInputStr = "Example text for Gzip compression."
llSuccess = loGzip.CompressStringToFile(lcInputStr,"utf-8","output.gz")
if (llSuccess = .F.) then
    ? loGzip.LastErrorText
    release loGzip
    release loDt
    return
endif

? "Gzip file created with custom last-modified date."


release loGzip
release loDt