One second off with pre epoch dates

[elharo]

second test below fails. This was probably introduced in #752

public void testEpoch() {
    assertParsedRfc3339(
        "1970-01-01T00:00:00.000Z", SecondsAndNanos.ofSecondsAndNanos(0, 0));
  }

  public void testOneSecondBeforeEpoch() {
    assertParsedRfc3339(
        "1969-12-31T23:59:59.000Z", SecondsAndNanos.ofSecondsAndNanos(-1, 0));
  }

[elharo]

For some reason line 404 of parseRfc3339WithNanoSeconds returns -553 for milliseconds for one second before the epoch, not -1000 or even -999.

[elharo]

Weird. This test not only fails, but fails with different values each time I run it:

  public void testDateTime() {  
	Calendar dateTime = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
    dateTime.set(1969, 11, 31, 23, 59, 59);
    long value = dateTime.toInstant().toEpochMilli();
    assertEquals(-1000L, value);
  }

[suztomo]

Memo: Affected versions:
v1.31.0
v1.32.0
v1.32.1
v1.32.2
v1.33.0