Java

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.

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.DateTime;
import com.chilkatsoft.chilkat2.Gzip;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example demonstrates how to set a custom last-modified date/time
        // that will be embedded in a Gzip file.

        Gzip gzip = new Gzip();
        DateTime dt = new DateTime();

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

        // Apply the date/time to the Gzip object:
        try {
            gzip.setDt(dt);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Compress a string so the custom date/time is embedded in the .gz:
        String inputStr = "Example text for Gzip compression.";
        try {
            gzip.compressStringToFile(inputStr, "utf-8", "output.gz");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Gzip file created with custom last-modified date.");
    }
}