HPROF: HAT thinks the timestamp in the format=b file is bad

Solaris SPARC 10_b72 & Solaris 9
Java 5.0_b64 (GA)
HAT 1.1

I run:
$ ./java -Xrunhprof:file=dump.hprof,format=b -jar SwingSet2.jar

then

$ ./hat <path>/dump.hprof

The "Dump file created" date is very wrong.

$ date
Mon Dec 6 17:50:09 GMT 2004

HAT reports: Dump file created Thu Apr 13 01:33:08 BST 1989

$ ls -l
   4179207 Dec 6 16:11 dump.hprof


###@###.### 2004-12-06 17:58:07 GMT
###@###.### 2004-12-06 18:00:58 GMT
###@###.### 2004-12-06 18:06:15 GMT