Fix end and start date comparators and make them all static so we don… #263

Job	Run time
unit_tests_artifact / tst_api_common / maven_test	3m 19s
unit_tests_artifact / tst_amq / maven_test	2m 40s
unit_tests_artifact / tst_api / maven_test	4m 40s
unit_tests_artifact / tst_core / maven_test	6m 46s
unit_tests_artifact / tst_iapi / maven_test	3m 9s
unit_tests_artifact / tst_ml / maven_test	2m 50s
unit_tests_artifact / tst_persistence / maven_test	3m 57s
unit_tests_artifact / tst_pubweb / maven_test	3m 13s
unit_tests_artifact / tst_sched / maven_test	3m 1s
unit_tests_artifact / tst_utils / maven_test	2m 39s
unit_tests_artifact / tst_web / maven_test	3m 48s
	40m 2s

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