Fix unit tests with Qt 5.11

Authored by vkrause on Mar 20 2018, 5:26 PM.

Description

Fix unit tests with Qt 5.11

Date/time JSON serialization changed in Qt, so run this back and forth
through our own serialization code instead.

Details

Committed
vkrauseMar 20 2018, 5:26 PM
Parents
R81:20063b6e0237: Fix Czech Railway unit tests
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