Revert "Don't remove milliseconds now that toString() includes them."

This reverts commit 37ec5822522baaa5b6e316103477d6da7e6d6a9c,
as 15da0a5af20fe6771bcb94ef8d46edbd5c8fb64c was also reverted with:
https://codereview.qt-project.org/#change,65560

Change-Id: I73bd91e3ac97384db27107051faead7a8cad3d91
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Skip failing qscriptengine tests on Windows.

Task-number: QTBUG-33622

Change-Id: Id719eadf3caa5ed34850ae189652f26eed7a6aea
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>