ISTWCMS-4964 Updated date-related tests to use computed dates that are always in the future

Lily Yanrequested to merge
feature/ISTWCMS-4964-l26yan-Update-date-related-tests-to-use-computed-dates into 3.0.x

ISTWCMS-4964 Updated date-related tests to use computed dates that are always in the future

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