Have DocumentListConverterTest working for all timezones

[apupier]

currently I have

Failed tests:
DocumentConverterTest.testToDocumentFormInputStream:114->verifyDocument:297->Assert.assertThat:865 level1Segment.get(DATS_FIELD) returned unexpected value
Expected: is <Fri Jul 03 00:00:00 CET 1863>
but: was <Fri Jul 03 06:00:00 CET 1863>
DocumentConverterTest.testToDocumentFromByteArray:138->verifyDocument:297->Assert.assertThat:865 level1Segment.get(DATS_FIELD) returned unexpected value
Expected: is <Fri Jul 03 00:00:00 CET 1863>
but: was <Fri Jul 03 06:00:00 CET 1863>
DocumentConverterTest.testToDocumentFromString:90->verifyDocument:297->Assert.assertThat:865 level1Segment.get(DATS_FIELD) returned unexpected value
Expected: is <Fri Jul 03 00:00:00 CET 1863>
but: was <Fri Jul 03 06:00:00 CET 1863>
DocumentListConverterTest.testToDocumentFormInputStream:117->verifyDocumentList:304->Assert.assertThat:865 level1Segment.get(DATS_FIELD) returned unexpected value
Expected: is <Fri Jul 03 00:00:00 CET 1863>
but: was <Fri Jul 03 06:00:00 CET 1863>
DocumentListConverterTest.testToDocumentFromByteArray:141->verifyDocumentList:304->Assert.assertThat:865 level1Segment.get(DATS_FIELD) returned unexpected value
Expected: is <Fri Jul 03 00:00:00 CET 1863>
but: was <Fri Jul 03 06:00:00 CET 1863>
DocumentListConverterTest.testToDocumentListFromString:93->verifyDocumentList:304->Assert.assertThat:865 level1Segment.get(DATS_FIELD) returned unexpected value
Expected: is <Fri Jul 03 00:00:00 CET 1863>
but: was <Fri Jul 03 06:00:00 CET 1863>
Tests in error:
JUnit4Provider.invoke:184->executeTestSet:240->executeWithRerun:280->executeFailedMethod:356 » ExceptionInInitializer
JUnit4Provider.invoke:184->executeTestSet:240->executeWithRerun:280->executeFailedMethod:356 » ExceptionInInitializer