History

Time	Change
2016-07-28 23:15:11+00:00	Created
2016-07-28 23:15:11+00:00	Associated with 閏秒の無いUTC
2016-07-28 23:15:11+00:00	Associated with 閏秒のない時刻系
2016-07-28 23:15:11+00:00	Associated with 閏秒のないUTC