Time Keeps Ticking

A note so that I never forget again: the time used by a ZipEntry instance in Java appears to keep ticking.

ZipEntry entry = new ZipEntry("foo");
long expected = System.currentTimeMillis();
entry.setTime(expected);
Thread.sleep(3000);
long seen = entry.getTime()

// This fails
assertEquals(expected, seen);

Update: it turns out that the problem turns out to be that DOS timestamps only store seconds with a precision of 2 seconds. The above could be reduced to:

ZipEntry entry = new ZipEntry("foo");

// Note: we set the seconds to an odd number
long expected = Calendar.getInstance()
    .set(2013, SEPTEMBER, 10, 12, 14, 1)
    .getTimeInMillis();
entry.setTime(expected);
long seen = entry.getTime()

// This fails
assertEquals(expected, seen);

More on MSDN.