History

Time	Change
2013-11-01 15:30:09+00:00	Created
2013-11-01 15:30:09+00:00	Associated with ⊿秒
2013-11-01 15:30:09+00:00	Associated with デルタ秒
2013-11-01 15:30:09+00:00	Associated with delta-seconds
2013-11-01 15:30:09+00:00	Associated with Δ秒
2014-09-01 09:30:31+00:00	Associated with delay-seconds