History

Time	Change
2014-05-06 10:59:48+00:00	Created
2014-05-06 10:59:48+00:00	Associated with valid date string with optional time
2014-05-06 10:59:48+00:00	Associated with 妥当な日付文字列と省略可能な時刻
2014-05-06 11:00:01+00:00	Associated with date string with optional time
2014-05-06 11:00:01+00:00	Associated with 日付文字列と省略可能な時刻