Bug: wrong dates for issues and issue comments

[silviubogan]

Example exported file: export_filename.zip. In the resolved issue called "Application crashed" the bug is obvious because the issue was created after the issue comment in it. The dates are different.

Screenshot of the original issue:

Screenshot of the migrated issue:

[silviubogan]

I migrated the issues from another repository. The exported data is this:
qt_mathemakid_issues.zip. The same bug occurred.