With the following code

Date newDate = new Date (Date.parse("12 Oct 1960 13:25:00"));
file.setLastModified(newDate.getTime());

I get java.lang.IllegalArgumentException: Negative time

And with this code

Date newDate = new Date (Date.parse("12 Oct 1960 13:25:00"));
Files.setAttribute(file.toPath(), "lastModifiedTime", FileTime.fromMillis(newDate.getTime()));

I get unknown date with the Linux file manager.