method ZipEntry.setTime(long) works incorrectly

Name: vpR10011 Date: 10/08/2002



Java 2 Platform Std.Ed. v1.4.1 API specification of the method
java.util.zip.ZipEntry.setTime(long) says:
"public void setTime(long time)

Sets the modification time of the entry.
Parameters:
    time - the entry modification time in number of milliseconds since the
           epoch"
    
Specification of constructor java.util.Date(long) defines "the epoch":
"...the standard base time known as "the epoch", namely January 1, 1970,
00:00:00 GMT".

Moreover, Java 2 Platform Std.Ed v1.4.1 API specification refers
to "GZIP file format specification version 4.3 (RFC 1952)" which defines
modification time as:
"MTIME (Modification TIME)
    This gives the most recent modification time of the original
    file being compressed. The time is in Unix format, i.e.,
    seconds since 00:00:00 GMT, Jan. 1, 1970. (Note that this
    may cause problems for MS-DOS and other systems that use
    local rather than Universal time.) If the compressed data
    did not come from a file, MTIME is set to the time at which
    compression started. MTIME = 0 means no time stamp is
    available."
    
    
But the method java.util.zip.ZipEntry.setTime(long) rejects modification
time if it is less than January 1, 1980, 00:00:00 GMT.

To reproduce this bug run the following test:
-----------test1.java------------
import java.io.PrintStream;
import java.util.zip.*;
import java.util.Date;

public class test1{

    private static String testString = "ZipEntryTest";
    public static void main(String argv[]) {
        ZipEntry ze = new ZipEntry("ZipEntryTest");
        Date date = new Date(10);
        ze.setTime(date.getTime());
        System.out.println("date.getTime(): "+date.getTime());
        System.out.println("ze.getTime(): "+ze.getTime());
        Date date1 = new Date(ze.getTime());
        System.out.println(date);
        System.out.println(date1);
    }
}
--------------------- Output ------------------------
% javac -d . test1.java
% java -version
java version "1.4.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)
% java test1
date.getTime(): 10
ze.getTime(): 315511200000
Thu Jan 01 06:00:00 GMT+06:00 1970
Tue Jan 01 00:00:00 GMT+06:00 1980
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