Refactored DateMapper for better date conversion handling and code re… #2628

Job	Run time
Unit tests & SQLite integration tests (7.4)	9m 15s
Run code style check (8.0)	2m 41s
Unit tests & SQLite integration tests (8.0)	9m 16s
Solr integration tests (7.4)	13m 17s
Unit tests & SQLite integration tests (8.1)	8m 45s
Solr integration tests (8.0)	13m 21s
Solr integration tests (8.1)	13m 23s
MySQL integration tests (7.4)	14m 31s
PostgreSQL integration tests (7.4)	28m 36s
MySQL integration tests (8.0)	14m 30s
PostgreSQL integration tests (8.0)	28m 18s
MySQL integration tests (8.1)	14m 37s
PostgreSQL integration tests (8.1)	25m 40s
	3h 16m 10s

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