Rust

Set a Custom Last-Modified Date in a Gzip File

See more Gzip Examples

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.

Rust

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

let gzip = chilkat::Gzip::new();
let dt = chilkat::DateTime::new();

// Set the date/time using a timestamp format (ISO 8601 style):
let _ = dt.set_from_timestamp("2025-11-15T12:45:26-05:00");

// Apply the date/time to the Gzip object:
if gzip.set_dt(&dt).is_err() {
    println!("{}", gzip.last_error_text());
    return;
}

// Compress a string so the custom date/time is embedded in the .gz:
let input_str = "Example text for Gzip compression.".to_string();
if gzip.compress_string_to_file(&input_str, "utf-8", "output.gz").is_err() {
    println!("{}", gzip.last_error_text());
    return;
}

println!("Gzip file created with custom last-modified date.");